K-9, Mark I
Legendary Artifact Creature — Robot Dog
Negative — As long as K-9 is untapped, other legendary creatures you control have ward 
.
Affirmative — 
, 
: Target legendary creature can't be blocked this turn.
Doctor's companion (You can have two commanders if the other is the Doctor.)
- CMC
- 1
- Mana cost
- Color identity
- U
- Rarity
- rare
- Set
- Doctor Who
- Price
- —
- EDHREC rank
- #3300
K-9, Mark I is a clue-generating artifact creature that pays for itself in card advantage the moment it hits the board. The real ceiling is Sophia, Dogged Detective, where every clue K-9 produces feeds directly into Sophia's investigate-matters engine — the two cards are practically designed to share a deck.
Best Commanders
Commanders with the highest synergy
Sophia, Dogged Detective
K-9, Mark I appears in over 71% of Sophia, Dogged Detective decks because every clue token K-9 generates is raw fuel for Sophia's triggered abilities, turning a single artifact creature into a continuous advantage engine.
Lara Croft, Tomb Raider
Lara Croft, Tomb Raider rewards artifact and clue interactions throughout her game plan, and K-9, Mark I slots in as a repeatable clue source that keeps Lara's investigate payoffs firing every turn.
Mendicant Core, Guidelight
Mendicant Core, Guidelight benefits from low-cost artifacts that generate additional tokens or resources, and K-9, Mark I delivers on both counts at a mana cost that keeps the curve honest.
Basim Ibn Ishaq
Basim Ibn Ishaq cares about artifacts entering and activating, and K-9, Mark I's clue production gives Basim a steady stream of artifacts to exploit without requiring extra setup.
The Celestial Toymaker
The Celestial Toymaker thrives on artifact density and token generation, and K-9, Mark I contributes both — a creature that doubles as a clue factory fits neatly into any Toymaker artifact-centric shell.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | not legal |
| pioneer | not legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
K-9, Mark I is legal in Commander, Legacy, Vintage, and Oathbreaker, but Commander is the only format where it sees meaningful play. In Legacy and Vintage, the card's rate doesn't compete — those formats demand faster, more impactful artifact creatures, and a clue-generator doesn't clear that bar. Commander is the natural home: the 100-card singleton environment rewards value creatures that generate incremental advantage over multiple turns, and K-9, Mark I's investigate synergies only get stronger in a multiplayer game where extra card draw compounds quickly.
Key Combos
Combo lines featuring this card
Price Context
Current price
unknown tier
Pricing data for K-9, Mark I isn't currently available, so check Scryfall or TCGPlayer for the latest figures before buying. Given its 71% inclusion rate in Sophia, Dogged Detective decks and appearance across several other high-volume commanders, demand is real — don't assume it's a bulk rare.
Explore
Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.