If you haven't gained 3 life by the time your end step begins, Griffin Aerie's ability won't trigger at all
More importantly, cycling through your deck to find your key pieces is still tough to do
Not only that, but even if your opponent is swinging in with a 10/10, you can still block it and gain 10 life, because thats how damage works in MTG
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Having a repeatable blink effect makes this silly, but its far from busted on its own