Cobra Trap #146
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Card Details
If a noncreature permanent under your control was destroyed this turn by a spell or ability an opponent controlled, you may pay 
rather than pay this spell's mana cost.
Create four 1/1 green Snake creature tokens.
Illustrated by Scott Chou
Rulings (4)
Oct 1, 2009
A spell or ability destroys a permanent only if that spell or ability specifically contains the word "destroy" in its text. If a spell or ability an opponent controls exiles a noncreature permanent you control, causes you to sacrifice a noncreature permanent, removes all loyalty counters from a planeswalker you control, or causes an ability you control to trigger (and then that ability destroys a permanent you control), Cobra Trap's alternative cost condition hasn't been met.
Oct 1, 2009
Casting a Trap by paying its alternative cost doesn't change its mana cost or mana value. The only difference is the cost you actually pay.
Oct 1, 2009
Effects that increase or reduce the cost to cast a Trap will apply to whichever cost you chose to pay.
Oct 1, 2009
You may ignore a Trap's alternative cost condition and simply cast it for its normal mana cost. This is true even if its alternative cost condition has been met.
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