Kaba Djinn

Haste, Mana Strike (Whenever this creature would deal combat damage, instead, at the beginning of your post-combat main phase, add that much mana to your mana pool that shares a color with this creature)
At the beginning of your upkeep, sacrifice Kaba Djinn unless you return another non-land perm- anent you control to owner's hand.
"Sadists. They love to break things."