Cheapest priced copy (Modern Horizons 3): $0.99 at Card Kingdom, near mint, their price list as of .
Metastatic Evangel 
Creature — Phyrexian Human Cleric · 3/1 · Uncommon · Modern Horizons 3 · #35
Whenever another nontoken creature you control enters, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
3 printings · $0.99 to $1.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Modern Horizons 3 | 35 | Uncommon | $0.99 | $1.49 |
| Modern Horizons 3 | 393 | Uncommon | $1.29 | $1.99 |
| The List | MH3-35 | Uncommon | — | — |
4 rulings from Wizards of the Coast
- 7 June 2024You don't have to choose every permanent or player that has a counter—only the ones you want to add counters to. Since "any number" includes zero, you don't have to choose any permanents at all, and you don't have to choose any players at all.
- 7 June 2024If a player or permanent has more than one kind of counter on it, and you choose for it to get additional counters, it must get one of each kind of counter it already has. You can't have it get just one kind of counter it already has and not the others.
- 7 June 2024When you proliferate, you can choose any permanent that has a counter, including ones controlled by opponents. You can choose any player who has a counter, including opponents. You can't choose cards in any zone other than the battlefield, even if they have counters on them.
- 7 June 2024Players can respond to a spell or ability whose effect includes proliferating. Once that spell or ability starts to resolve, however, and its controller chooses which permanents and players will get new counters, it's too late for anyone to respond.