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Tekuthal, Inquiry Dominus

Legendary Creature — Phyrexian Horror

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.)

CMC
4
Mana cost
{2}{U}{U}
Color identity
U
Rarity
mythic
Set
Phyrexia: All Will Be One
Price
$3.63
EDHREC rank
#1254
Buy on TCGplayer
Tekuthal, Inquiry Dominus card art
Tekuthal, Inquiry Dominus doubles every proliferate trigger you produce, turning incremental counter strategies into exponential ones the moment it hits the table. The cost — four mana for a 4/4 with hexproof upside — is fair enough that you're rarely sad to cast it, and Magistrate's Scepter alone illustrates the ceiling: one proliferate becomes two, which becomes four, and suddenly extra turns arrive in clusters. If your deck proliferates at all, Tekuthal, Inquiry Dominus belongs in it.

Best Commanders

Commanders with the highest synergy

01
Kilo, Apogee Mind

Kilo, Apogee Mind

84.6% of decks · synergy 0.76

Kilo, Apogee Mind is built around stacking counters and proliferating repeatedly, so Tekuthal, Inquiry Dominus isn't a support piece — it's the card that makes every activation count twice and compresses the number of turns needed to close a game.

02
Ezuri, Stalker of Spheres

Ezuri, Stalker of Spheres

77.6% of decks · synergy 0.76

Ezuri, Stalker of Spheres generates proliferate triggers off drawn cards, and Tekuthal, Inquiry Dominus converts each of those triggers into two, letting a high-draw turn translate directly into a runaway counter advantage that the table can't race.

03
Inspirit, Flagship Vessel

Inspirit, Flagship Vessel

69.0% of decks · synergy 0.60

Inspirit, Flagship Vessel accumulates lore counters and leverages proliferate to accelerate through its chapters, and Tekuthal, Inquiry Dominus cuts the time to resolution roughly in half by doubling every trigger that fires.

04
Tidus, Yuna's Guardian

Tidus, Yuna's Guardian

52.3% of decks · synergy 0.48

Tidus, Yuna's Guardian cares about charge counters and incremental proliferate value, and Tekuthal, Inquiry Dominus amplifies every step of that plan, making counter milestones arrive a full cycle ahead of schedule.

05
Xavier Sal, Infested Captain

Xavier Sal, Infested Captain

48.7% of decks · synergy 0.45

Xavier Sal, Infested Captain spreads poison and proliferates to close the gap to ten, and Tekuthal, Inquiry Dominus turns each proliferate into two, halving the number of steps required to poison out the table.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern legal
pioneer legal
standard not legal
vintage legal
pauper not legal
oathbreaker legal

Commander is unambiguously where Tekuthal, Inquiry Dominus lives — the card is purpose-built for the long-game counter ecosystems that define the format, and 84% inclusion in Kilo, Apogee Mind decks alone confirms its standing. In Legacy, Modern, and Pioneer, it's legal but irrelevant: four mana for a static doubler on a niche keyword doesn't compete in formats where games end on turn three or four. Vintage has the raw power density to host it in theory, but the same speed problem applies. Oathbreaker is the one adjacent format where Tekuthal, Inquiry Dominus could see real play, particularly as a signature spell in a proliferate-centric shell — though the card is a better fit in the 99 than as the spell itself.

Key Combos

Combo lines featuring this card

Price Context

Current price

$3.63 cheap tier

At $3.63, Tekuthal, Inquiry Dominus sits at the low end of mythic rare pricing, which reflects a niche that's wide within proliferate decks but shallow across the broader format. That price is stable value — demand is consistent enough to prevent a floor collapse, but the card won't spike without a new pushed proliferate commander pulling it into a much larger player base.

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Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.