Seventh Wonder

Whenever an opponent casts a spell, they may
deal 2 damage to you.
Whenever you cast a spell, you may gain 3 life.
At the beginning of each end step, if you gained
7 or more life this turn, draw a card and put an eternity counter on Seventh Wonder. Then, if
there are 7 or more eternity counters on it, you
win the game.