Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.
2015-06-22
wotc
Once it triggers, prowess isn't connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.
2015-06-22
wotc
If, during its controller's declare attackers step, Mage-Ring Bully is tapped or is affected by a spell or ability that says it can't attack, then Mage-Ring Bully doesn't attack. If there's a cost associated with having it attack, its controller isn't forced to pay that cost. If they don't, Mage-Ring Bully doesn't have to attack.
2015-06-22
wotc
Any spell you cast that doesn't have the type creature will cause prowess to trigger. If a spell has multiple types, and one of those types is creature (such as an artifact creature), casting it won't cause prowess to trigger. Playing a land also won't cause prowess to trigger.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Legal
Modern
Legal
Legacy
Legal
Pauper
Legal
Vintage
Legal
Penny
Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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