Landwalk is a term that appears within a cards rules text as "[type]walk," where [type] is usually a land type (Plains, Island, Swamp, Mountain, Forest or Non-basic) but can be the card type land, any land type, or any combination.
Landwalk is an evasion ability. Meaning a creature with landwalk is unblockable as long as the defending player controls at least one land with the specified type.
Mountainwalk is one of the six "land walk" abilities that creatures can have, the others being Plainswalk, Islandwalk, Forestwalk, Swampwalk and Non-basic Landwalk. Each refers to a specific land type, and means that if the defending player controls a land of that type, then the attacking creature cannot be blocked.
No, Riot does not stack in Magic: The Gathering.
Magic the Gathering is not a cult. It is a collectible card game.
An open-minded Christian will have no issues with Magic the Gathering.
Yes, in Magic: The Gathering, a commander can be exiled.
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There are over 20,000 different cards in Magic: The Gathering.
"Valakut" is a land card in Magic: The Gathering.
No, a creature is not considered a spell in Magic: The Gathering.
No, a planeswalker is not considered a creature in Magic: The Gathering.
No, a planeswalker is not considered a spell in Magic: The Gathering.
Yes, creatures are considered permanents in Magic: The Gathering.