Witch Engine

five generic mana one black mana Creature — HorrorPower and toughness4/4

Swampwalk (This creature can't be blocked as long as defending player controls a Swamp.)

tap this permanent : Add one black mana . Target opponent gains control of this creature. (Activate only as an instant.)

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11 printings

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Witch Engine rulings

2008-04-01
Because the ability is targeted, it is not a mana ability. It can only be activated when you have priority, and goes on the stack like other non-mana abilities.

Witch Engine keyword rules

Landwalk Rule 702.14

Landwalk is a generic term that appears within an object’s rules text as “[type]walk,” where [type] is usually a land type, but it can also be the card type land plus any combination of land types, card types, and/or supertypes.

Landwalk is an evasion ability.

A creature with landwalk can’t be blocked as long as the defending player controls at least one land with the specified land type (as in “islandwalk”), with the specified type or supertype (as in “artifact landwalk”), without the specified type or supertype (as in “nonbasic landwalk”), or with both the specified type or supertype and the specified subtype (as in “snow swampwalk”). (See rule , “Declare Blockers Step.”)

Landwalk abilities don’t “cancel” one another.

Multiple instances of the same kind of landwalk on the same creature are redundant.