MTG Salvation

When Servant of Volrath leaves the battlefield, sacrifice a creature.

1B, Discard a creature card: Volrath the Fallen gets +X/+X until end of turn, where X is the discarded card's converted mana cost.

At the beginning of combat on your turn, put a -1/-1 counter on up to one target creature.

1: Until your next turn, Volrath the Shapestealer becomes a copy of target creature with a counter on it, except it's 7/5 and gains this ability.

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.)

Change the text of target permanent by replacing all instances of one color word with another or one basic land type with another until end of turn. (For example, you may change "nonred creature" to "nongreen creature" or "plainswalk" to "swampwalk.")