Jhessian Thief

two generic mana one blue mana Creature — Human RoguePower and toughness1/3

Prowess (Whenever you cast a noncreature spell, this creature gets +1/+1 until end of turn.)

Whenever this creature deals combat damage to a player, draw a card.

"Where's the fun in an escape if it's not at least a little daring?"

Showing Magic Origins#62

Price

0.08 $

Foil 0.56 $

15 printings · up to 0.12 $

Daily estimate from Scryfall, not a shop quote.

2015-06-22
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.
2015-06-22
Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.
2015-06-22
Once it triggers, prowess isn’t connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.