The Dungeon Master

You choose the targets for all spells and abilities.
When The Dungeon Master enters the battlefield, create a red planeswalker token named Ancient Dragon with 1 loyalty counter; +1:
Create a 1/1 black Skeleton creature token that
can only block creatures attacking Ancient
Dragon; -3: Deal 5 damage to target creature
and "When Ancient Dragon dies, the player that caused it to die draws two cards and gains 5 life."