Experimental Overload is the standard bearer for all blue-red decks in Core Set 2021 limited. To make the most of this card, put at least four instant or sorcery cards in your graveyard before playing it — because you can return any of those spells to your hand.
Imagine that you have two copies of Experimental Overload in your deck. You can put one in your graveyard and return it with the help of a second copy. Rinse and repeat for unlimited tokens.