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Koilos Roc
Creature — Bird
common
Flash Flying When this creature enters, create a tapped Powerstone token. (It's an artifact with ": Add . This mana can't be spent to cast a nonartifact spell.")
3/3
Card Kingdom
CardmarketSemantic Tags
Triggers when a creature or permanent enters the battlefield. Prime blink targets.
Difficult to block or grants evasion. Includes flying, menace, fear, intimidate, shadow, skulk, horsemanship, unblockable effects, and cards that grant these abilities.
A keyword ability that lets a player play a card any time they could cast an instant. See rule 702.8, “Flash.”
Flash-focused strategy — playing at instant speed for tempo and information advantage.
A keyword ability that restricts how a creature may be blocked. See rule 702.9, “Flying.”
Creatures that tap to produce mana. Llanowar Elves, Birds of Paradise, Elvish Mystic.
A permanent with a repeatable activated ability that converts excess mana into value.
A card or token on the battlefield. See rule 110, “Permanents.”
Accelerates mana production beyond the one-land-per-turn baseline. Umbrella tag — see ramp subtypes for land ramp, mana dorks, mana rocks, and rituals.
Creates creature tokens, Treasure tokens, Food tokens, Clue tokens, or other token types.
Format Legality
Price history
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Printings (1)
| Set | Rarity | TCGplayer | Card Kingdom | Cardmarket |
|---|---|---|---|---|
| The Brothers' War#55 | common | · | · | · |
Related Concepts
Related Rules
If an ability would produce one or more mana of an undefined type, it produces no mana instead.
Some abilities produce mana based on the type of mana another permanent or permanents “could produce.” The type of mana a permanent could produce at any time includes any type of mana that an ability of that permanent would produce if the ability were to resolve at that time, taking into account any applicable replacement effects in any possible order. Ignore whether any costs of the ability could or could not be paid. If that permanent wouldn’t produce any mana under these conditions, or no type of mana can be defined this way, there’s no type of mana it could produce.
To “tap [a permanent] for mana” is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, “Mana Abilities.”
An ability that triggers whenever a permanent “is tapped for mana” or is tapped for mana of a specified type triggers whenever such a mana ability resolves and produces mana or the specified type of mana.
A replacement effect that applies if a permanent “is tapped for mana” or tapped for mana of a specific type and/or amount modifies the mana production event while such an ability is resolving and producing mana or the specified type and/or amount of mana.
If an object’s enters-the-battlefield triggered ability or replacement effect refers to X, and the spell that became that object as it resolved had a value of X chosen for any of its costs, the value of X for that ability is the same as the value of X for that spell, although the value of X for that permanent is 0. This is an exception to rule 107.3i.
The tap symbol is {T}. The tap symbol in an activation cost means “Tap this permanent.” A permanent that’s already tapped can’t be tapped again to pay the cost. A creature’s activated ability with the tap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.
The untap symbol is {Q}. The untap symbol in an activation cost means “Untap this permanent.” A permanent that’s already untapped can’t be untapped again to pay the cost. A creature’s activated ability with the untap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.
Rulings
Although all the cards in The Brothers' War that create Powerstone tokens create a tapped Powerstone token, entering the battlefield tapped isn't part of the token's definition. Notably, if you create a token that is a copy of a Powerstone token, the token copy won't enter the battlefield tapped.
Powerstone tokens are a kind of predefined token. Each one has the artifact subtype "Powerstone" and the ability "{T}: Add {C}. This mana can't be spent to cast a nonartifact spell."
You can use the {C} added by a Powerstone token on anything that isn't a nonartifact spell. This includes paying costs to activate abilities of both artifact and nonartifact permanents, paying ward costs, and so on.