Jeskai Elder
Creature — Human Monk
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, you may draw a card. If you do, discard a card.
Craig J Spearing
Core Set 2021 (M21)
• #53Rulings
You draw a card and discard a card all while Jeskai Elder's ability is resolving. Nothing can happen between the two, and no player may choose to take actions.
(wotc • 2020-06-23)
Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.
(wotc • 2014-09-20)
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.
(wotc • 2014-09-20)
Once it triggers, prowess isn't connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.
(wotc • 2014-09-20)
Rulings
You draw a card and discard a card all while Jeskai Elder's ability is resolving. Nothing can happen between the two, and no player may choose to take actions.
(wotc • 2020-06-23)
Prowess goes on the stack on top of the spell that caused it to trigger. It will resolve before that spell.
(wotc • 2014-09-20)
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.
(wotc • 2014-09-20)
Once it triggers, prowess isn't connected to the spell that caused it to trigger. If that spell is countered, prowess will still resolve.
(wotc • 2014-09-20)