Mayael's Aria {R}{G}{W}
Enchantment
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.
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Cards that do something similar expected a card that isn't here?
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