Megrim

Enchant creature Enchanted creature has "T: The next time a source of your choice would deal damage to target creature this turn, prevent that damage."

Prevent the next 1 damage that would be dealt to any target this turn. Draw a card.

W, T: This creature loses this ability and becomes an Aura enchantment with enchant creature. Attach it to target creature. You may pay W to end this effect. Enchanted creature can't attack.

Buyback 3 (You may pay an additional 3 as you cast this spell. If you do, put this card into your hand as it resolves.) Target creature can't attack this turn.

Whenever you cast a spell, you gain 1 life.

Enchant creature Enchanted creature gets +1/+3. W: Return this Aura to its owner's hand.

Put a card from your hand on top of your library: Prevent all damage that would be dealt by target instant or sorcery spell this turn.

W: This creature gets +0/+1 until end of turn.