Hammerheim

Oracle Text

T: Add R.

T: Target creature loses all landwalk abilities until end of turn.

Card Rulings

10/4/2004 This can be used on a creature without landwalking but has no effect.
10/1/2009 Causing a creature to lose landwalk abilities is useful only during the declare attackers step or earlier. Once the declare blockers step begins, it’s too late to block the creature.