As this land enters, you may reveal an Island or Mountain card from your hand. If you don't, this land enters tapped.
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Odin's son journeyed to the icy realm of Jotunheim, seeking to test his raging thunder against the Frost Giant horde.
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If an effect instructs you to put one of these lands onto the battlefield tapped, it will still enter the battlefield tapped even if you reveal a land card from your hand.
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If a land card with an appropriate subtype is entering the battlefield from your hand at the same time as one of these lands, you may reveal the other land to have the "Snarl" enter untapped.
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You may reveal any land card with either or both of the appropriate subtypes. It doesn't have to be a basic land card.
(16/04/2021)
The "Snarl" itself doesn't have any land subtypes. You can't reveal one to satisfy the ability of another.
