You can cast a spell for its prowl cost any time in a turn after a creature you control of a matching type has dealt combat damage to a player. It doesn't matter if that player left the game, if that creature left the battlefield or left your control, or if that creature no longer has a matching type.
2020-09-25
wotc
To determine the total cost of a spell, start with the mana cost or alternative cost (such as a prowl cost) you're paying, add any cost increases, then apply any cost reductions. The mana value of the spell is determined only by its mana cost, no matter what the total cost to cast the spell was.
2020-09-25
wotc
Prowl compares the creature types of the spell with the creature types of the creatures that dealt combat damage to players this turn. Normally this means that you can cast Enigma Thief for its prowl cost only if a Sphinx or Rogue dealt combat damage to a player, but if an effect causes the spell to have other creature types, the prowl ability is also satisfied by a creature with those additional types having dealt combat damage to a player.
2020-09-25
wotc
If a nonland permanent changes control while it's the target of Enigma Thief's ability, that permanent won't be a legal target as the ability resolves. Any remaining legal targets will be returned to their owners' hand.
Format Legality
Standard
Not Legal
Future
Not Legal
Historic
Not Legal
Timeless
Not Legal
Gladiator
Not Legal
Pioneer
Not Legal
Modern
Not Legal
Legacy
Legal
Pauper
Not Legal
Vintage
Legal
Penny
Legal
Commander
Legal
Oathbreaker
Legal
Standardbrawl
Not Legal
Brawl
Not Legal
Alchemy
Not Legal
Paupercommander
Not Legal
Duel
Legal
Oldschool
Not Legal
Premodern
Not Legal
Predh
Not Legal
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