I turn an opponent's land into an artifact using Liquimetal Coating. While I have a Viridian Revel on the battlefield, I destroy that land with any artifact-destroying ability or spell (doesn't matter which). Does Viridian Revel triggers as the land goes to the graveyard or does the land stop being an artifact as it changes zone?
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"De potentia juvenis somniabat, nunc de Mundo somniat..."
Yes and yes. Leaves-the-battlefield triggers trigger based on the game state right before the event rather than after. This is an exception to the rule. So the game sees an artifact going to the graveyard even though the new object in the graveyard doesn't have the artifact type.
603.10 Normally, objects that exist immediately after an event are checked to see if the event matched any trigger conditions, and continuous effects that exist at that time are used to determine what the trigger conditions are and what the objects involved in the event look like. However, some triggered abilities are exceptions to this rule; the game “looks back in time” to determine if those abilities trigger, using the existence of those abilities and the appearance of objects immediately prior to the event. The list of exceptions is as follows:
603.10a Some zone-change triggers look back in time. These are leaves-the-battlefield abilities, abilities that trigger when a card leaves a graveyard, and abilities that trigger when an object that all players can see is put into a hand or library.
603.6c Leaves-the-battlefield abilities trigger when a permanent moves from the battlefield to another zone, or when a phased-in permanent leaves the game because its owner leaves the game. These are written as, but aren’t limited to, “When [this object] leaves the battlefield, . . .” or “Whenever [something] is put into a graveyard from the battlefield, . . . .” (See also rule 603.10.) An ability that attempts to do something to the card that left the battlefield checks for it only in the first zone that it went to. An ability that triggers when a card is put into a certain zone “from anywhere” is never treated as a leaves-the-battlefield ability, even if an object is put into that zone from the battlefield.
Former Rules Advisor
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(The Gamers: Dorkness Rising)
"Any sufficiently analyzed magic is indistinguishable from science."
(Girl Genius - Fairy Tale Theater Break - Cinderella, end of volume 8)
Yes, the artifact-land reverts to a land as it enters the grave.
Viridian cares about the object that WAS on the battlefield.
RULES OF MAGIC :
http://magic.wizards.com/en/game-info/gameplay/rules-and-formats/rules