Magical Meltdown (SHVA-EN042)

When this card is activated: You can add 1 "Aleister the Invoker" from your Deck to your hand. The activation of your cards and effects that include an effect that Fusion Summons a Fusion Monster cannot be negated, also your opponent's cards and effects cannot activate when a monster is Fusion Summoned this way. You can only activate 1 "Magical Meltdown" per turn.

spell / Field, Shadows in Valhalla