Zombies you control have flying. , , Sacrifice another nontoken creature: Create an X/X blue Zombie creature token, where X is the sacrificed creature’s toughness.
If another permanent enters the battlefield under your control as a copy of Geralf, Visionary Stitcher, the legend rule requires you to put one of them in a graveyard before you can take any actions. You can't sacrifice the copy to pay the cost of the original Geralf's activated ability.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.