Grixis's Challenge

Start with this card in the challenge zone. At beginning of your upkeep put an age counter on it an roll a dice:
1/2 - You discard a card
3/4 - Grixis's Challenge X damage to you and X damage to a creature you control being X half of the number of age counters on it, rounded up.
4/6 - Return a non land permanent you control to your hand.