Cards like Valkyrie Harbinger, Griffin Aerie, and Crested Sunmare flood the board with tokens
She is very much about the -3 ability, killing a key threat and leaving you with both a planeswalker and a Treasure (which is especially nice with Fatal Push)
This is also another early holiday card that doesnt do anything that doesnt work within the rules of Magic
If you do, each opponent loses 1 life and you gain that much life.) At the beginning of your postcombat main phase, if you gained 3 or more life this turn, exile Sorin of House Markov, then return him to the battlefield transformed under his owner's control
If you have a way to exile it from the graveyard before the persist ability resolves, say with Scavenging Ooze, you can fizzle the ability to prevent the creature from coming back