Transform Self

choose one:
Your life total becomes 5 and you gain "you can only be dealt damage by sources with flying";
Your life total becomes 10 and you gain "on your upkeep deal 3 damage to target creature.";
Your life total becomes 20 and you have on your upkeep deal 20 damage to target creature, that creature deals damage equal to it's power to you.";
"I'll let you decide which one I am."
-The OVERLORD