Core Set 2021 · M21 · uncommon
Sorcery
wotc · 2020-06-23
The value of X is determined only as Experimental Overload resolves. The Weird's power and toughness don't change if the number of instant and sorcery cards in your graveyard changes.
wotc · 2020-06-23
Because Experimental Overload is still on the stack while it's resolving, it doesn't count towards the value of X.
wotc · 2020-06-23
You exile Experimental Overload even if you don't return a card to your hand.