(Look at the top X cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Once Lydia Frye has been blocked, increasing the blocking creature's power to 3 or greater won't cause Lydia Frye to become unblocked
And it is a win condition, assuming you can get enough lands out all at once
Wistfulness, Vibrance, Emptiness, Deceit, and Catharsis change what they do based on the colors you use to cast them, which makes every decision feel meaningful
Seeing the potential for a new human to bring it food, the Gitrog Monster bowled through her besiegers, saving her
It's put into the graveyard from the stack, not the battlefield, so its last ability won't trigger
Creature foil card from the Magic The Gathering set Ikoria Lair of Behemoths (MTG-IKO-385)