Whenever Gwaihir attacks, target attacking creature gains flying until end of turn.
At the beginning of each end step, if you gained 3 or more life this turn, create a 3/3 white Bird creature token with flying and "Whenever this token attacks, target attacking creature gains flying until end of turn."
Gwaihir is a mono-white go-wide flyers and lifegain payoff that builds an evasive air force, then closes games through unblockable damage in the sky. Each turn you trigger 3+ lifegain to spawn 3/3 flying Birds, while Gwaihir hands flying to ground creatures so your whole board attacks unimpeded. Lean on token swarms plus anthems and you eventually fly over everyone for lethal.
Mono-white consistency and access to the best white token, anthem, and recursion staples
Free 3/3 fliers every turn once you hit modest lifegain thresholds
Evasion-granting attack trigger lets even big ground creatures connect
Strong incidental lifegain synergy with the format's deep mono-white lifegain pool
Mono-white struggles with card advantage and ramp compared to other colors
Heavily reliant on the commander and tokens; vulnerable to board wipes
Lifegain payoff is grindy and can be slow against fast combo decks
Little interaction beyond white's removal and taxes