K-9, Mark I
Negative — As long as K-9 is untapped, other legendary creatures you control have ward {1}. Affirmative — {1}{U}, {T}: Target legendary creature can't be blocked this turn. Doctor's companion (You can have two commanders if the other is the Doctor.)
How K-9 decks play in EDH
K-9, Mark I is a mono-blue commander costing U, and its legendary artifact creature - robot dog line shapes the whole deck around it. Built-in evasion means damage gets through reliably, so effects that scale that damage are worth more than extra bodies. The cards below are the ones K-9, Mark I decks actually play most often, grouped by the job they do.
Most-played cards
20 cards · about $32.02Play rates from EDHREC. Prices from Scryfall, refreshed daily.
Card draw (7)
Removal (1)
Counterspells (1)
Creatures (4)
Synergy & payoffs (5)
Lands (2)
Build the full 100
Grimoire generates a complete, Commander-legal K-9, Mark I decklist with a written strategy, a full mana base and live prices — from the whole card pool, or only from cards you already own.
Start with K-9K-9 deck questions
What colours can I use in a K-9, Mark I deck?
K-9, Mark I has a mono-blue colour identity, so every card in the deck must be blue or colourless. That includes mana symbols in rules text, not just casting cost.
What are the best cards for K-9, Mark I?
The cards played most often in K-9, Mark I decks include Fblthp, Impossibly Lost, Hapatra, the Desert Frost, Seafarer's Quay. The full list of staples above is grouped by the job each card does, so you can see the deck's skeleton rather than just a pile of names.
How much does a K-9, Mark I deck cost?
The 20 most-played cards shown above come to roughly $32.02 at current market prices. A complete 100-card build costs more, and Grimoire can generate a budget version instead if you set a price ceiling.
Can I build a K-9, Mark I deck from cards I already own?
Yes. Import your collection into Grimoire and choose "my cards" when you build. The generator will only use cards you actually own, and the Missing Cards page shows what you would need to buy to finish any list.