Hammerheim | Magic: The Gathering
Formats Hammerheim is Legal in
Official Oracle Text for Hammerheim
: Target creature loses all landwalk abilities until end of turn.
Official Rulings for Hammerheim
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.