Skeleton Key

Equipped creature gets +2/+2. Equip—Discard a card.

Exile target artifact or land. Structural Distortion deals 2 damage to that permanent's controller.

As an additional cost to cast this spell, sacrifice a permanent. Exile target artifact, creature, or enchantment.

Flash (You may cast this spell any time you could cast an instant.) Enchant creature Enchanted creature gets +3/+0 and has first strike.

3, T, Sacrifice this artifact: It deals 2 damage to any target.

Burn from Within deals X damage to any target. If a creature is dealt damage this way, it loses indestructible until end of turn. If that creature would die this turn, exile it instead.

At the beginning of each upkeep, if no spells were cast last turn, transform this creature.