Urborg
Legendary Land
: Add 
.
: Target creature loses first strike or swampwalk until end of turn.
"Resignedly beneath the sky/The melancholy waters lie./So blend the turrets and shadows there/That all seem pendulous in air,/While from a proud tower in town/Death looks gigantically down." —Edgar Allan Poe, "The City in the Sea"
Bryon Wackwitz
Masters Edition III (ME3)
• #214Rulings
Causing a creature to lose swampwalk is useful only during the declare attackers step or earlier. Once the declare blockers step begins, it’s too late to block the creature.
(wotc • 2009-10-01)
Urborg’s second ability affects only the first strike ability, not the part of the double strike ability that acts like first strike.
(wotc • 2009-10-01)
You choose whether the targeted creature loses first strike or swampwalk as the ability resolves. If the creature has both abilities, it will lose just one of them.
(wotc • 2009-10-01)
If a creature loses first strike after first strike combat damage has been assigned, it won’t deal damage during the second combat damage step.
(wotc • 2008-04-01)
The ability can be used on a creature without First Strike or Swampwalk but has no effect.
(wotc • 2004-10-04)
Rulings
Causing a creature to lose swampwalk is useful only during the declare attackers step or earlier. Once the declare blockers step begins, it’s too late to block the creature.
(wotc • 2009-10-01)
Urborg’s second ability affects only the first strike ability, not the part of the double strike ability that acts like first strike.
(wotc • 2009-10-01)
You choose whether the targeted creature loses first strike or swampwalk as the ability resolves. If the creature has both abilities, it will lose just one of them.
(wotc • 2009-10-01)
If a creature loses first strike after first strike combat damage has been assigned, it won’t deal damage during the second combat damage step.
(wotc • 2008-04-01)
The ability can be used on a creature without First Strike or Swampwalk but has no effect.
(wotc • 2004-10-04)