Koskun Falls is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
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 paysfor each creature they control that's attacking you.
Complete guide
Koskun Falls is a classic World Enchantment that brings a unique tax effect to black decks, effectively acting as a 'Ghostly Prison' for your opponents. It forces your enemies to pay two mana for every creature they want to send your way, significantly slowing down aggressive strategies. However, this powerful defense requires a constant sacrifice of a creature's utility to stay on the battlefield.
Maintaining the Falls
Koskun Falls has a triggered ability that occurs at the beginning of your upkeep. To keep it on the battlefield, you must tap an untapped creature you control. If you don't have an untapped creature or choose not to tap one, you must sacrifice Koskun Falls. Note that the 'World' supertype means only one world permanent can exist on the battlefield at a time; if another World permanent enters, Koskun Falls is put into the graveyard immediately via state-based actions.
The Defensive Tax
While Koskun Falls is active, creatures can't attack you unless their controller pays {2} for each of those creatures. This payment is made during the declare attackers step. If the attacking player cannot or will not pay the cost, those creatures cannot be declared as attackers against you. Importantly, this tax only applies to creatures attacking you directly, not to those attacking a planeswalker you control.
Strategic Considerations
Since the upkeep cost requires tapping a creature, this enchantment works best in decks that can generate tokens or have creatures with 'Inspired' abilities or high toughness that don't need to attack. Be mindful of the timing; the tapping happens during your upkeep, before you draw your card for the turn, so you must have a creature ready to go as soon as the turn begins.
Interaction examples
Black Market ConnectionsAt the beginning of your first main phase, Black Market Connections can create a 3/2 Shapeshifter token. However, because Koskun Falls requires a creature to be tapped during your upkeep (which happens before the main phase), you cannot use a token created by Black Market Connections on the same turn to pay for the Falls. You must have a creature surviving from a previous turn to keep the enchantment alive.
Phyrexian ArenaIf you control both cards, both trigger at the start of your upkeep. As the controller, you choose the order they are put onto the stack. You can choose to draw a card from Phyrexian Arena first, or resolve the Koskun Falls trigger first to tap your creature and ensure your defenses remain active before resolving other effects.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Koskun Falls
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
Unless some effect explicitly says otherwise, a creature that can't attack you can still attack a planeswalker you control.
No other card is named in this ruling.
- #2· Wizards of the Coast
This has the supertype world. When a world permanent enters, any world permanents that were already on the battlefield are put into their owners' graveyards. This is a state-based action called the "world rule." The new world permanent stays on the battlefield. If two world permanents enter at the same time, they're both put into their owners' graveyards.
No other card is named in this ruling.
- #3· Wizards of the Coast
In the Two-Headed Giant format, you still only have to pay once per creature.
No other card is named in this ruling.
Legal formats
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Meta decks with Koskun Falls
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