Revived Demon

When Revived Demon enters the battlefield, you get {e}{e}{e}{e} (four energy counters).
Flying, protection from instants.
Pay {e}: Put a +1/+1 counter on Revived Demon. It gains your choice of haste, vigilance or lifelink until the end of turn.
At the beginning of your upkeep, pay {e}{e}. If you cannot, you lose the game.