I run four copies in a Modern poison counters deck, where that extra +1/+1 really makes a difference when I attack with a Phyrexian Crusader
A strong zombie commander does one of three things: it makes tokens to go wide, it recurs creatures from the graveyard so your board never stays cleared, or it turns a pile of dying zombies into card advantage and life drain
Facilier, Agent Provocateur Marshmallow, Persistent Guardian Mickey Mouse, Wayward Sorcerer Ursula, Power Hungry Rafiki, Mysterious Sage The Queen, Wicked and Vain Elsa, Spirit of Winter Other amethyst cards offer the power to draw cards from your deck - more so than other ink colours in Lorcana - to help you find the cards you need
Suspending, foretelling, exiling off the top of your library, anything is fair game as long as it doesn't come from your hand