OIL-SLICK RAISED FOILCheapest priced copy (Edge of Eternities Commander): $2.99 at Card Kingdom, near mint, their price list as of .
Tekuthal, Inquiry Dominus 
Legendary Creature — Phyrexian Horror · 3/5 · Mythic · Phyrexia: All Will Be One · #349
Flying
If you would proliferate, proliferate twice instead.
{1}{U/P}{U/P}, Remove three counters from among other artifacts, creatures, and planeswalkers you control: Put an indestructible counter on Tekuthal. ({U/P} can be paid with either {U} or 2 life.)
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
7 printings · $2.99 to $34.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Edge of Eternities Commander | 78 | Mythic | $2.99 | — |
| Phyrexia: All Will Be One | 71 | Mythic | $3.99 | $7.99 |
| Phyrexia: All Will Be One | 302 | Mythic | $13.99 | $15.99 |
| Phyrexia: All Will Be One | 349 | Mythic | — | $34.99 |
| Phyrexia: All Will Be One | 431 | Mythic | — | $24.99 |
| Phyrexia: All Will Be One Promos | 71p | Mythic | $7.99Out of stock | $10.99 |
| Phyrexia: All Will Be One Promos | 71s | Mythic | — | $10.99 |
6 rulings from Wizards of the Coast
- 4 February 2023If a permanent ever has both +1/+1 counters and -1/-1 counters on it at the same time, they're removed in pairs as a state-based action so that the permanent has only one of those kinds of counters on it.
- 4 February 2023To 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.
- 4 February 2023An ability that triggers "Whenever you proliferate" triggers even if you chose no permanents or players while doing so.
- 4 February 2023If 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.
- 4 February 2023Players 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.
- 4 February 2023You don't have to choose every permanent or player that has a counter, only the ones you want to add another counter 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.