

Since the last thing that happened was the fusion summon of player A's monster, their Meltdown prevents player B from activating their Construct's effect. Then player A's Construct is summoned at chain link one and its effect triggers in a new chain afterward. However, we are still resolving a chain, so no cards can be activated at this point anyway. When player B's Construct is summoned as chain link two, Magical Meltdown would prevent the opponent from activating cards or effects. Meltdown is a "when effect." This means that it can miss its timing and this is precisely what's happening here. The reason for this lies in the way Meltdown is worded. However, player A will be able to activate their own effects despite player B controlling a copy of on their own. Indeed, player B will not be able to activate their effects after the successful summon because of player A's Meltdown. Does player A's Meltdown now prevent player B from using their Construct's effect while player B's Meltdown prevents player A from activating their Construct's effect (and possibly the effects of Shaddoll monsters used as fusion materials in both cases)? Both Constructs have on-summon trigger effects. The chain resolves backwards and player B summons a copy of Construct from the extra deck and then player A also summons a copy of Construct at chain link one. Player A activates a copy of Shaddoll Fusion and player B chains their copy of. Assume both players control a copy of Magical Meltdown. Next, we will check what happens in the mirror match. It makes Shaddolls very resilient to hand traps. This is also the main reason why Meltdown is so extremely powerful in Shaddoll strategies.

This means, they cannot chain Ash Blossom to Hedgehog or Construct (depending on which of them is chain link two). In this chain, the opponent cannot activate cards or effects. After the summon, Construct and Hedgehog can activate their effects (sending a Shaddoll card from deck to graveyard and adding a Shaddoll monster from deck to hand) in a new chain. They use and as materials for the summon. Player A uses to special summon El Shaddoll Construct from the extra deck while Magical Meltdown is active on their side of the field. It is this precise time window in which the opponent cannot activate cards or effects. Moreover, the Shaddoll fusion materials used for the fusion summon would also be able to activate their effects. For example, would trigger to send a Shaddoll card from the deck to the graveyard. Typically, the player who fusion summons a Shaddoll monster can activate a variety of effects after the summon. The main application of this is seen in Invoked decks. Next, we will take a look at 's effect that prevents the opponent from activating cards and effects when your monster is fusion summoned by an effect that fusion summons a monster. Then the Shaddoll Fusion would still resolve since the Judgment would try to negate its activation, but Meltdown would protect the Shaddoll Fusion from having its activation negated. A different scenario would be if was chained to the activation of Shaddoll Fusion.

However, Ash Blossom does not negate the activation of Shaddoll Fusion but merely negates its effect.

Magical Meltdown only prevents activations from being negated. In this case, the Ash Blossom will successfully negate the effect of Shaddoll Fusion. Now the question might arise whether or not Magical Meltdown protects the Shaddoll Fusion from being negated by Ash Blossom.
