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.)
Near Mint Unlimited - $0.50
Lightly Played Unlimited - $0.48
Moderately Played Unlimited - $0.41
Heavily Played Unlimited - $0.36
Damaged Unlimited - $0.26