whenever you gain life cards mtg Powerful and card draw combo in Magic: The Gathering What counts as "gaining life"

Creature Ooze Cumulative upkeep (At the beginning of your upkeep, put an age counter on this permanent, then sacrifice it unless you pay for each age counter on it.) Mwonvuli Ooze's power and toughness are each equal to 1 plus twice the number of age counters on it

Its quite literally exponentially increasing: Heaven forbid you Yorion on the next turn

Everyone knows you're planning to proliferate, and they might start gunning for you

Polukranos, Engine of Ruin adds lifelink to the mix and grows to 6/6, plus it gives you Hydra tokens when it and your other nontoken hydras die

If they play as well as were hoping, they should show up from time to time in worlds where they make sense for the current story, but I doubt theyll ever be in every set