Humans gain experience
When this creature dies, if it had a revival counter on it, return it to the battlefield with one fewer revival counter on it at the beginning of the next end step
Faithless Looting, Unexpected Windfall, Windfall, and many other cards let you discard in order to draw one or more
All of this is actually pretty straightforward for anyone whos played with Sagas before
I do like the effect too, where the Primordial Ooze mindlessly attacks, mindlessly grows, and you have to keep pumping mana into it (more mana as it grows, too!) otherwise it'll turn around and attack you
Omega Is Very Powerful In Magic: The Gathering The Stunning Superboss Has Arrived Omegas ability to stun enemy cards is a great one in the Commander format, which traditionally involves multiple players