Mayael's Aria

メイエルのアリア (Mayael's Aria) (ja)

Enchantment (CMC 3)
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.