Note that Jump-start seems to require exiling the card that you're casting, so it's a more specific version of flashback rather than a variant on retrace.
Loyal Apprentice 1R
Creature -- Human Artificer
Haste Lieutenant — At the beginning of combat on your turn, if you control your commander, create a 1/1 colorless Thopter artifact creature token with flying. That token gains haste until end of turn.
2/1
They actually just recently changed it again, but not in a way that combos with Forbidden Orchard. Seems the new new rule doesn't change very much; it only seems to affect things like Gather Specimens and Crafty Cutpurse.
Reality Scramble 2RR
Sorcery
Put target permanent you own on the bottom of your library. Reveal cards from the top of your library until you reveal a card that shares a card type with that permanent. Put that card onto the battlefield and the rest on the bottom of your library in a random order.
Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)
Coveted Jewel 6
Artifact
When Coveted Jewel enters the battlefield, draw three cards. T: Add three mana of any one color.
Whenever one or more creatures an opponent controls attack you and aren't blocked, that player draws three cards and gains control of Coveted Jewel. Untap it.
Saheeli's Directive XRRR
Sorcery
Improvise
Reveal the top X cards of your library. You may put any number of artifact cards with converted mana cost X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard.
Liliana's Contract 3BB
Enchantment (Rare)
When Liliana's Contract enters the battlefield, you draw four cards and you lose 4 life.
At the beginning of your upkeep, if you control four or more Demons with different names, you win the game.
This seems to be the Weibo preview. Don't currently have a good translation for the name, or anything for the flavor text.
Dryad Something-Or-Other 1G
Creature -- Dryad (Uncommon) T: Look at the top card of your library. If it's a land card, you may reveal it and put it into your hand.
1/3
Original source unclear but appears to be real. Provisional translation:
Sarkhan's Broken Seal 3R
Enchantment (R)
Whenever you cast a creature spell with power 4, 5, or 6, Sarkhan's Broken Seal deals 4 damage to any target.
Whenever you cast a creature spell with power 7 or greater, Sarkhan's Broken Seal deals 4 damage to each opponent and each creature and planeswalker they control.
Loyal Apprentice 1R
Creature -- Human Artificer
Haste
Lieutenant — At the beginning of combat on your turn, if you control your commander, create a 1/1 colorless Thopter artifact creature token with flying. That token gains haste until end of turn.
2/1
Reality Scramble 2RR
Sorcery
Put target permanent you own on the bottom of your library. Reveal cards from the top of your library until you reveal a card that shares a card type with that permanent. Put that card onto the battlefield and the rest on the bottom of your library in a random order.
Retrace (You may cast this card from your graveyard by discarding a land card in addition to paying its other costs.)
Coveted Jewel 6
Artifact
When Coveted Jewel enters the battlefield, draw three cards.
T: Add three mana of any one color.
Whenever one or more creatures an opponent controls attack you and aren't blocked, that player draws three cards and gains control of Coveted Jewel. Untap it.
Saheeli's Directive XRRR
Sorcery
Improvise
Reveal the top X cards of your library. You may put any number of artifact cards with converted mana cost X or less from among them onto the battlefield. Then put all cards revealed this way that weren't put onto the battlefield into your graveyard.
Liliana's Contract 3BB
Enchantment (Rare)
When Liliana's Contract enters the battlefield, you draw four cards and you lose 4 life.
At the beginning of your upkeep, if you control four or more Demons with different names, you win the game.
Current translation:
Disdainful Pyromancer 1R
Creature -- Human Wizard (Rare)
R, T, Discard a card: Draw a card.
2R, T, Sacrifice Disdainful Pyromancer: Disdainful Pyromancer deals 4 damage to target creature.
2/2
Heroic Reinforcements 2RW
Sorcery
Create two 1/1 white Soldier creature tokens. Until end of turn, creatures you control get +1/+1 and have haste.
Dryad Something-Or-Other 1G
Creature -- Dryad (Uncommon)
T: Look at the top card of your library. If it's a land card, you may reveal it and put it into your hand.
1/3
Sarkhan's Broken Seal 3R
Enchantment (R)
Whenever you cast a creature spell with power 4, 5, or 6, Sarkhan's Broken Seal deals 4 damage to any target.
Whenever you cast a creature spell with power 7 or greater, Sarkhan's Broken Seal deals 4 damage to each opponent and each creature and planeswalker they control.
Edit: Thanks!