Falboor, The Izzet Wildcard

Haste
When Falboor, The Izzet Wildcard enters the battlefield, draw a card then discard a card.
At the beginning of combat on your turn Falboor, The Izzet Wildcard gets +X/+0 for each card you discarded this turn, until the end of your turn.
Whenever Falboor, The Izzet Wildcard leaves the battle field, return all cards you have discarded this turn back to your hand.