Darlem, Light and Darkness

Flying, Vigilance, Deathtouch, Lifelink, Hexproof
At the beginning of each player's draw step, that player draws an additional card.
Whenever an opponent draws a card, Darlem, Light and Darkness deals 1 damage to that player.
Whenever Darlem deals combat damage to a player, you may pay {w}{w/b}{b} if that player has 15 or less life. When you do, that player loses the game.
Each turn this card gains 2/2
Reduce card cost in your hand by 2