Apparently using Tragic Arrogance on Avacyn's first turn out while playing Tragic Arrogance that turn will net a player with permanent prevent damage to all their creatures.
octal9 wrote: Apparently using Tragic Arrogance on Avacyn's first turn out while playing Tragic Arrogance that turn will net a player with permanent prevent damage to all their creatures. Wait, what? That is gamebreaking.