You can use both Solemn Judgment and Solemn Warning on Polymerisation, but for different reasons.
Solemn Warning can negate Polymerisation because it is a card effect that Special Summons.
Solemn Judgment can negate Polymerisation simply because it is a Spell card.
This is the main reason people don't understand why Warning can negate Gorz but not Judgment, when in their minds both Warning and Judgment can negate Monster Reborn. Sure, both can negate Monster Reborn, but for very different reasons.
Take note that if you do not negate the Spell card, you cannot "negate" the monster summoned by it. By the time the monster actually comes out, it is already considered a successful special summon. This part I think can be explained by someone else better.
Currently playing - Yu-Gi-Oh! 5D's Tag Force 5, Dissidia 012: Duodecim Final Fantasy Dueling Network username: aerisfanboy
lol I remember that card! I've never actually thought it could be abused, though.
Here's another question regarding fusion summoning and Voltic.
I'm probably overthinking this, but here goes: If you inflict damage with Voltic via, let's say, a monster attacks him in DEF position (unnecessary, but it happens, lol), can you Special Summon an Elemental Hero Monster(s) (Tempest, Electrum, etc.) that says in the card text "Must be Fusion Summoned and cannot be Special Summoned by other ways"? (Provided you fullfilled the Fusion Summoning Conditions prior).
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No. The "it cannot be special summoned by other ways" prevents it.
Correct, and that's also known previously as "NOMI" - which must following the specify way to Summon that monster and can't reusing in any way but that method, ever it dead in same way as Semi-NOMI or lower type. It's like a forbidden ritual of summon to do only that way.
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