Mayael's Aria [Alara Reborn]

Set: Alara Reborn Type: Enchantment Rare Cost: {R}{G}{W} At the beginning of your upkeep, put a +1/+1 counter on each creature you control if you control a creature with power 5 or greater. Then you gain 10 life if you control a creature with power 10 or greater. Then you win the game if you control a creature with power 20 or greater.