Example: Diseased Vermin reads, in part, "At the beginning of your upkeep, Diseased Vermin deals X damage to target opponent previously dealt damage by it, where X is the number of infection counters on it." If Diseased Vermin phases out, it "remembers" how many counters it has and also which opponents it has previously damaged
But there are some more versatile ways to empty out your mana pool
You draw cards equal to that creature's power
Brawl Not Legal Vintage Legal Timeless Not Legal Commander Legal Pauper Not Legal Oathbreaker Legal Penny Not Legal Toolbox Notes and Rules Information for Summon: Esper Valigarmanda: Summon: Esper Valigarmanda's second, third, and fourth chapter abilities aren't mana abilities
Scarcity, condition, and utility: the value of a Magic card Magic card From everything written above, a few things follow -- namely that the rarity system determines a card's scarcity