Caves of Koilos
Land
: Add 
.: Add 
or 
. This land deals 1 damage to you.
- CMC
- 0
- Mana cost
- Color identity
- BW
- Rarity
- rare
- Set
- Dominaria United Promos
- Price
- —
- EDHREC rank
- #125
Caves of Koilos enters untapped and produces white or black mana immediately, with the only cost being one life per colored activation — cheap enough that it rarely matters. In two-color decks like Ulalek, Fused Atrocity, that's a strict upgrade over a basic that enters tapped, and the life payment is noise compared to the tempo you preserve.
Best Commanders
Commanders with the highest synergy
Ulalek, Fused Atrocity
Ulalek, Fused Atrocity demands both white and black mana reliably on curve, and Caves of Koilos delivers either on the turn you need it without the enters-tapped tax that slows Eldrazi tribal setups down.
Betor, Ancestor's Voice
Betor, Ancestor's Voice runs a tight Orzhov gameplan where consistent two-color access from turn one matters more than avoiding one life — Caves of Koilos fits that bill exactly.
Temmet, Naktamun's Will
Temmet, Naktamun's Will needs both colors active early to set up token strategies, and Caves of Koilos gives that flexibility without entering tapped and costing a full tempo.
Zurgo Stormrender
Zurgo Stormrender plays aggressively, so every tapped land is a real cost — Caves of Koilos enters ready to cast spells immediately, which aligns with the deck's speed.
Aminatou, Veil Piercer
Aminatou, Veil Piercer runs a blink-heavy Orzhov shell where holding up mana at instant speed is often essential, and Caves of Koilos provides that without the entered-tapped penalty.
Format Analysis
Where it lives, where it can’t
| Format | Verdict |
|---|---|
| commander | legal |
| legacy | legal |
| modern | legal |
| pioneer | legal |
| standard | not legal |
| vintage | legal |
| pauper | not legal |
| oathbreaker | legal |
In Commander, Caves of Koilos is a reliable dual land for any Orzhov or five-color deck — untapped, immediately functional, and the one-life cost is almost never relevant across a 40-life game. In Modern and Pioneer, it competes with fetchlands and typed duals, so it sees play primarily in budget builds or decks that have exhausted better options. Legacy and Vintage have access to Underground Sea, Scrubland, and fetchable duals, which push Caves of Koilos entirely off the table in those formats. Oathbreaker mirrors Commander's calculus: the life payment is negligible, and consistent early mana is the whole game.
Key Combos
Combo lines featuring this card
Price Context
Current price
unknown tier
Pricing data for Caves of Koilos isn't available in this snapshot, but it has been printed multiple times and historically sits well under two dollars — making it one of the most accessible untapped dual lands in the Orzhov color pair. If you're building on a budget and need reliable white-black mana that doesn't enter tapped, Caves of Koilos is worth grabbing at essentially any price point it shows up at.
Explore
Sources
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.