Choking Vines | Magic: The Gathering
Formats Choking Vines is Legal in
Official Oracle Text for Choking Vines
X target attacking creatures become blocked. Choking Vines deals 1 damage to each of those creatures. (This spell works on creatures that can't be blocked.)
Official Rulings for Choking Vines
10/4/2004 : You can declare zero targets, with X=0.
4/1/2008 : Choking Vines isn't particularly effective against creatures with trample. Since the creature with trample has no blocker to assign damage to, all the damage will be assigned to the defending player.
4/1/2008 : You may target a blocked creature with Choking Vines. Choking Vines will deal 1 damage to it, and have no other effect on it.
4/1/2008 : If a previously unblocked creature becomes blocked as a result of Choking Vines, any “When this creature becomes blocked” abilities that creature has will trigger. Any “When this creature becomes blocked by a creature” abilities that creature has won't trigger.