Hot answers tagged magic-the-gathering
Collateral damage says: As an additional cost to cast Collateral Damage ... Comprehensive Rule 706.10 says: To copy a spell ... means to put a copy of it onto the stack; a copy of a spell isn’t cast. ... Per 706.10, the copy of Collateral Damage isn't cast, so you don't have to pay the cost again. Copying a spell does not trigger Prowess. ...
In addition to Mycosynth Lattice, there is at least one other way that I know of. When you cast a spell with the Convoke keyword, you can pay a colored mana cost by tapping a creature of that color. In order to pay a cost that isn't in your colors this way, you would need a somewhat elaborate setup. First, you would need to control a creature of the other ...
From the card rulings: 9/20/2014: [...] Each copy is created on the stack, so it's not "cast". Abilities that trigger when a player casts a spell won't trigger. Since the copy isn't "cast", you don't have to pay attention to any abilities saying "as an additional cost to cast [card]...". This also means that prowess does not trigger.
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