Fusion Reserve (LDK2-ENK37) - Legendary Decks II (2024 Reprint) Unlimited

Reveal 1 Fusion Monster in your Extra Deck, add 1 of the Fusion Materials listed on that card from your Deck to your hand, then you can add 1 "Polymerization" from your Graveyard to your hand.
(Disclaimer: This card features a 2020 Copyright date.)