Koskun Falls
World Enchantment
At the beginning of your upkeep, sacrifice this enchantment unless you tap an untapped creature you control.
Creatures can't attack you unless their controller pays 
for each creature they control that's attacking you.
- CMC
- 4
- Mana cost
- Color identity
- B
- Rarity
- rare
- Set
- Homelands
- Price
- $15.90
- EDHREC rank
- #10771
Koskun Falls shuts down creature attacks for one black mana a turn — the closest black gets to Ghostly Prison without being white. The upkeep rider (tap a creature you control) is trivially paid in any token or stax shell, and the payoff is a persistent tax that forces opponents to either commit resources or leave you alone.
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 |
Commander is where Koskun Falls earns its slot — three opponents mean three attack vectors, and a per-attacker tax scales with threat count in ways that single-combat formats never stress-test. In Legacy and Vintage it's legal but sees no meaningful play; the formats move too fast and interact at instant speed, so a slow enchantment that only taxes combat doesn't match the pace. Oathbreaker shares Commander's multiplayer math, which makes the Falls viable there too, especially in black stax lists that need coverage white normally provides.
Key Combos
Combo lines featuring this card
Budget Alternatives
Cheaper options that do most of the same work
Ghostly Prison and Propaganda do the same job for around $1–2 each, but both require white or blue — Koskun Falls is the go-to when your commander's color identity locks you out of those. Bathe in Dragonfire aside, black's closest analog at a lower price point is Sphere of Safety, though that asks for an enchantment-heavy build to pay off.
Price Context
Current price
$15.90 mid tier
At $15.90, Koskun Falls sits in mid-tier — expensive enough to feel it, not so expensive it's out of reach. It's a single-printing reserved-list card, so the price reflects genuine scarcity rather than hype, and it isn't coming down.
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Sources
Mentioned
Updated . Data from Scryfall, EDHREC, and Commander Spellbook.