
Sorcery
Create an X/X blue and red Weird creature token, where X is the number of instant and sorcery cards in your graveyard. Then you may return an instant or sorcery card from your graveyard to your hand. Exile Experimental Overload.
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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.