Kayn

1)  When an allied unit kills another unit, give that ally +1|+1 and heal it 2.

2) +1 starting mana. "Each game, the first time an ally kills an enemy and survives, create a random Darkin Equipment in hand. It costs 2 less."

3)  When an ally kills another unit, give that ally +2|+2 and heal it to full.