
Sorcery
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Weird
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.
Because Experimental Overload is still on the stack while it's resolving, it doesn't count towards the value of X.
You exile Experimental Overload even if you don't return a card to your hand.