MTG Salvation

Insect tribal? What's this now? I think it's a cool card, it just would need some support in the set to be printable, such as a lot more insects printed. That would be a cool tribal actually, I wouldn't mind having insects replace elves as the primary green tribe for a set or two, elves are overdone to all hell.

Enslave From Within BBB
Sorcery (R)
Look at target player's hand. You may pay the mana cost of a creature card in that players hand, using B as mana of any color. If you do, put that creature card onto the battlefield under your control.

Not sure of the wording of this card, but you guys get the gist of it, right?

You are probably thinking of Incremental Blight, and my card is different.

I laughed when I saw the name, and the card is alright, so no complaints I guess.

Terraced Decimation 5BB
Sorcery
Target creature gets -1/-1 until end of turn.
Two target creatures get -2/-2 until end of turn.
Three target creatures get -3/-3 until end of turn.

Rockrider is interesting. Not sure how great it is giving flash to a R/G creature when flash is least based in those colors, but whatever, it makes the card function. As for the rest of it, it's pretty narrow, works against fetches and the like, but I'd say it's good overall.

Manipulation Clock 1UU
Enchantment (U)
After your upkeep step, if it was the first upkeep step of your turn, you get an additional upkeep step.

Halpless Wanderer is weird, but it seems balanced enough. Two quick fixes: one, I think that you meant "Hapless" in the card name, and two, it should say "...reveal the top card of target opponent's library...".

Goblin Strategist 1RR
Creature - Goblin
t: Target Goblin creature you control fights with a creature that target player chooses under his or her control.
His plans are so secret, not even he knows them.
2/2

Puncture Blade is simple, I suppose. No doubt it's balanced. Not sure of the flavor; how does a blade give trample? Whatever. Good card that could see print.

Master Forgesmith1WR
Creature - Human Artificer (R)
WR,t: Put an Equipment artifact token onto the battlefield named "Steel Sword" with "Equipped creature gets +2/+1" and "Equip 2".
1/2

Well, sure. It's big, it's red, and it's probably gonna be somewhat like the Obligatory Splashy Red Mythic That Timmies Will Love (or OSRMTT, for short. Rolls off the tongue, doesn't it?) of a block in the future.

Method to Madness 2RR
Enchantment (U)
Whenever you discard a card, put a madness counter on ~.
Whenever a creature enters the battlefield under your control, you may remove a madness counter from ~. If you do, ~ deals 2 damage to target creature or player.

As much as I'd love yelling "Duh... twinning!!!" when I cast this spell, I do think it's undercosted. Make it cost 5 or 6 and it's good.

Wherewithal 2B
Instant (C)
Target creature that is blocking or being blocked gets +X/-X, where X is the power of a creature that is blocking or being blocked by that creature.
"I will pay any price."

Well, it's certainly interesting, but I'd say for 8 (including every color), a 5/4 unblockable with a super-Vindicate every turn is a bit underpowered. I'd add a couple more abilities or ramp up the P/T.

Water the Plants 3GGG
Sorcery (R)
Put two -1/-1 counters on each blue creature and two +1/+1 counters on each green creature.

Whoa there. Blue should not get instant speed Vindicate for 2 mana, even with the tapped drawback, which isn't actually that much of a drawback. Shuffling it in is a very very minor drawback that can actually be a boon for you if the opponent is trying to reanimate. Very dicey. Move the cost up by at least U if you're really trying to push it, I would cost this as 2UU myself.

Collective Decay 3BB
Sorcery (R)
All creatures get -X/-X until end of turn, where X is the number of creatures on the battlefield.

The first part of Throw Hard I get, it's kind of like Artillerize and it isn't bad. But the second part? I just don't get why the creature would be put on the bottom from a red damage-dealing spell. It's kind of odd.

Large Boulder 1
Artifact - Equipment (C)
~ can only be equipped to creatures with power 3 or greater.
Equipped creature gains +2/+1 and "t, sacrifice ~: ~ deals 3 damage to target creature or player."
Equip 1

It's good. I don't see it being played too often though, but it's a good drawback for that card. I like it.

Inferior Getaway 3UG
Instant (R)
Return all creatures to their owner's hand except for the creature with the highest power.
"Hoo boy, that was a close call! We barely got away from that one, Skragg!"
-Grunk, goblin nomad

It's overpowered. Can you imagine plopping this down on turn 4 while your opponent is still just setting up? I think it would be balanced if you took off flash and made it a 6/6 or gave it firebreathing or something.

Spectrum Shifter 5
Creature - Shapeshifter (R)
If W was used to cast ~, it gains first strike.
If U was used to cast ~, it gains flying.
If B was used to cast ~, it gains deathtouch.
If R was used to cast ~, it gains haste.
If G was used to cast ~, it gains trample.
3/3

Underpowered. The idea is nice, but it should be at least a 4/3 for that mana cost (3/2s for 3 of one color are normal, and I count this as a drawback). I don't think it would be busted if you made it 5/3.

Greech, Doddering Goblin RR
Legendary Creature - Goblin
Haste
At the beginning of every upkeep, the person who's upkeep it is gains control of ~.
As long as ~ is not controlled by it's owner, it gets -2/-2
4/3

Good catch. Edited to a 3/3.

As for your card, I think it's underpowered. You could get away with reducing the cost a bit. But it is interesting.

Innocent Bystander 1WW
Creature - Human
Soulbond
When a creature paired with ~ dies, flip ~.
"Garv, are you okay?"
1/1
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Avenger of Fallen Allies
(W) Creature - Human Warrior
First strike, Soulbond
As long as ~ is paired with another creature, both creatures are indestructible.
"Never again."
3/2