Alduin, World Eater

Flying, menace

When Alduin, World Eater enters the battlefield, destroy each create an opponent controls with mana value 3 or less.

Whenever a creature an opponent controls dies, put
a +1/+1 counter on Alduin.

At the beginning of your upkeep, if Alduin has 20 or more +1/+1 counters on him, target opponent loses X life,
where X is equal to their starting life total.