yugioh the agents deck Yu-Gi-Oh! - Agent of Miracles - Jupiter (SDLS-EN003) - Structure Deck: Lost Sanctuary - 1st Edition Yugioh SPYRAL Deck - Double

Chthonian Polymer X TRAP Activate only when your opponent Fusion Summons a Fusion Monster

The issue with this strategy is that two specific cards are required for these powerful monsters to be summoned

Although this Deck Master explained to Serenity that her ability allowed a Fusion Summon without needing "Polymerization" (albeit with the cost of discarding 1 Spell Card), she never specified the locations of the necessary Fusion Materials

Since the cards have different values, it can take a bit of practice and preparation to make the best trades

Dummy Golem X EARTH Level 2 [ Rock / FlipEffect ] ATK 800 DEF 800 FLIP: Your opponent selects 1 monster they control