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King of the Swamp effect could discard itself to add Polymerization from deck to hand

C Common Dinowrestler Martial Ankylo X EARTH Level 2 [ DinosaurEffect ] ATK 1000 DEF 0 During damage calculation, if another "Dinowrestler" monster you control battles an opponent's monster (Quick Effect): You can send this card from your hand or field to the GY

C Common Performapal Hip Hippo X EARTH Level 3 [ BeastEffect ] ATK 800 DEF 800 After you Normal Summon this card, you can Tribute Summon 1 Level 7 or higher monster in face-up Attack Position during your Main Phase this turn, in addition to your Normal Summon/Set

There's only 2 in the entire game