MTG Salvation

Blitz Predator 4RR
Creature - Dinosaur Avatar (Rare)
Trample
Enrage - Whenever Blitz Predator is dealt damage, if it isn't a token, create a token that's a copy of it. It gains haste. Exile it at the beginning of the next end step.
A predator always becomes hungrier when he has more stomachs to fill.
4/4

Fate Reforged - Delve

Sultai Trawlers 4G
Creature - Human Rogue (C) [Sultai Watermark]
When Sultai Trawlers enters the battlefield, choose target face-up exiled card you own. Put that card into your graveyard.
"Gold and gemstones cannot slay a dragon. We may yet find a solution in the Gurmag."
4/4

Votes: Rudyard, Blackwaltz3

Dream Curdle 2UB
Sorcery (R)
Each player exiles his or her hand, then draws a card for each card he or she exiled this way.
"I think you need a change of ideas." - Ashiok

Wirewood Beastbreaker 5GG
Creature - Elf Shaman (C)
When Wirewood Beastbreaker enters the battlefield, you may put a creature card from your hand onto the battlefield.
"People think of Wirewood as a home of monstrous beasts and fragile elves. But is it wise to call fragile those who have tamed those beasts?"
1/1

That land is very limited in its Hideaway ability. Having only 5 permanents (or less, three of which have to be lands) and 2 cards in hand basically means by the time you use the hidden spell you're probably so far behind it won't help you. Try removing some of its restrictions. I'm not sure about exiling cards from your graveyard either.

Since you wanted to see more Relic support, here are two cards (I know I'm being naughty)

Compulsive Collector 2UB
Creature - Human Rogue (Uncommon)
Excavate (Whenever this creature deals combat damage to a player, create a colorless Relic artifact token with "1, Sacrifice this Relic: Draw a card, then discard a card.")
Compulsive Collector gets +1/+0 for each Relic you control.
Sacrifice a Relic: Compulsive Collector gains menace until end of turn.
"Each of these trinkets is part of a greater whole. I must have them all! I must!"
1/4

Gazzard, Explorer Chieftain 2RW
Legendary Creature - Viashino Warrior (Rare)
Trample, haste,
Excavate (Whenever this creature deals combat damage to a player, create a colorless Relic artifact token with "1, Sacrifice this Relic: Draw a card, then discard a card.")
Other creatures you control have excavate.
2, Sacrifice X Relics: Search your library for a card with converted mana cost X or less, reveal that card, then put it into your hand. Then shuffle your library.
A true leader does not sit back and care for his people. He leads them into the unknown, paving the way for a better future.
3/3

That seems quite limited to be honest. I think you'd have to change the wording to affect non-mana abilities considering you'd have to tap it for mana as the very first ability before activating the second one. If you make it tap for a single colorless as well, I think it'll be fine.

Reckless Researcher 2U
Creature - Human Wizard (Uncommon)
Excavate (Whenever this creature deals combat damage to a player, create a colorless Relic artifact token with "1, Sacrifice this Relic: Draw a card, then discard a card.")
1R, Sacrifice a Relic: Reckless Researcher deals 2 damage to target creature or player.
"I thought if I applied immense force to it, I could activate it."
2/2

Rudyard, Blackwaltz3

Planar Tutor 1R
Instant (Rare)
Search your library for a land or planeswalker card and reveal that card. Shuffle your library, then put the card on top of it.
"You still have so much to learn about the multiverse. Let me show you."
-Jaya Ballard, to Chandra Nalaar.

I feel like the templating would either be three separate triggers, or this -

At the beginning of your upkeep, you may discard a card, then you may tap two untapped creatures you control, then you may pay 3 life. If you do any of these, draw X cards, where X is the number of costs paid this way.

And even then I'm not too sure.. It's a complicated one that is.

Ishari, the Starswimmer 1(W/U)
Legendary Creature - Merfolk Wizard (Mythic Rare)
Whenever another creature you control becomes the target of a spell or ability an opponent controls, you may exile Ishari, the Tide Starswimmer and that creature. If you do, return each card exiled this way to the battlefield under their owner's control at the beginning of the next end step.
"Our kin have domain over all the world's rivers, but there are paths we must still learn to swim through."
1/2

Ogre Starkiller 3B
Creature - Ogre Archer
When Ogre Starkiller enters the battlefield, each player sacrifices a creature with flying he or she controls.
3B, T: Target player sacrifices a creature with flying. If he or she can't, that player loses 3 life instead.
3/3

Rocco, Noct

Motion 1R
Sorcery (U)
Creatures you control gain haste until end of turn.
//
Object 3UU
Instant (U)
Aftermath (Cast this side only from your graveyard. Then exile it.)
Counter target spell.

Three mana to save a creature and play it for free again next turn? Eldrazi love this. It's way too strong. Without the free casting it's a fine uncommon, if you want to bump it to a rare then reduce the cost by a little (like 2 mana), but not entirely. The wording is a little off too I feel, I feel like it should read "spells you cast that share a name with that card cost less to cast).

Mage's Duel 2R
Sorcery (Uncommon)
Create two 1/1 blue Human Wizard creature tokens with prowess.
Flashback 2U
"Fights between mages involve careful planning and use of their resources, and generally a lot of bravado." -Kurga, Pit Master

It seems interesting, but I feel like "from outside the game" effects shouldn't go any lower than rare, even if in some environments outside the game it the sideboard. Also if its ability triggers on a spell being cast, wouldn't "cast the imprinted card" be more properly worded than "play" since that only applies to lands now.

Spiraling Madness 1U
Instant (Rare)
Draw a card.
Cycling 3 (3, Discard this card: Draw a card.)
Madness U (When you discard this card, discard it into exile. When you do, cast it for its madness cost or put it into your graveyard.)
Flashback U, Discard a card. (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Set: Eventide

Midnight Dance 4(W/B)(W/B)
Sorcery (Rare)
Return target creature or enchantment card from your graveyard to the battlefield.
Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)
"When the Gwyllions dance, the souls of the dead come and dance with them."
-Talara, Elvish Safewright

(Fun fact, this would complete the cycle with Waves of Aggression, Call the Skybreaker, Spitting Image and Worm Harvest. Apparently there never was a rare WB retrace card.)

Seems like the first ability should be a triggered ability akin to Miracle. Otherwise it's an interesting card, but not overpowered. Though there are definitely ways it can be abused, but that's what magic is about.

Domri, Fist of Krosa 4RG
Planeswalker - Domri (Mythic)
(+2) Reveal the top four cards of your library. Put all creature cards revealed this way into your hand and the rest into your graveyard.
(-X) Domri, Fist of Krosa deals X damage to up to one target creature. You may have target creature you control fight that creature.
(-8) Search your library for up to three creature cards and put them onto the battlefield, then shuffle your library. Creatures you control gain haste until end of turn.
Starting loyalty: (4)

My votes go to StonerOfKruphix and Controll (dismiss seems like a different version of Tribute, I quite like it)

Rakdos Bloodletter BR
Creature - Goblin Warrior (U)
Whenever Rakdos Bloodletter attacks, you may have it deal 1 damage to target creature.
Masochist - As long as Rakdos Bloodletter is damaged, it gets +1/+0 and has menace.
Nothing says "don't mess with me" like stabbing yourself in front of your enemies.
2/2