Target attacking creature gets +X/+0 until end of turn.

Draw a card at the beginning of the next turn's upkeep.

Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.

Buyback {2} (You may pay an additional {2} as you cast this spell. If you do, put this card into your hand as it resolves.)

Creatures you control get +1/+0 until end of turn.

Storm (When you cast this spell, copy it for each spell cast before it this turn.)

+1: Add {R}{R}{R}. Spend this mana only to cast instant or sorcery spells.

+1: Discard up to three cards, then draw that many cards.

-8: You get an emblem with "You may cast instant and sorcery spells from your graveyard. If a spell cast this way would be put into your graveyard, exile it instead."

Each instant and sorcery card in your graveyard gains flashback until end of turn. The flashback cost is equal to its mana cost.

Flashback {4}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Whenever a player casts a spell from their hand, that player exiles it, then exiles cards from the top of their library until they exile a card that shares a card type with it. That player may cast that card without paying its mana cost. Then they put all cards exiled with Possibility Storm on the bottom of their library in a random order.

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.)

Spawning Breath deals 1 damage to any target. Create a 0/1 colorless Eldrazi Spawn creature token. It has "Sacrifice this creature: Add {C}."

Gain control of target creature until end of turn. Untap that creature. It gains haste until end of turn. Add two mana of any one color. (The creature can attack and {T} this turn.)

Double the power of target creature until end of turn.

Put any number of cards from your hand on the bottom of your library, then draw that many cards plus one.

Valakut Stoneforge enters the battlefield tapped.

{T}: Add {R}.