Lunar Mystic
From Commander 2020 set
Lunar Mystic
Creature — Human Wizard
2/2
Whenever you cast an instant spell, you may pay . If you do, draw a card.
Rulings
- The triggered ability will go on the stack on top of the instant spell and resolve before it.
- The decision to pay is made when the triggered ability resolves. It’s not an additional cost of the instant spell.