Ignition-like Effect

Similar to Ignition Monster Effects, some Spell Cards have an Ignition-like Effect which requires a manual activation by the card's controller during their Main Phase 1 or 2.

Activating the card "Fusion Gate" (placement onto the field or flip face-up) does not Special Summon monsters, so at that time, neither "Royal Oppression" nor "Solemn Warning" can be activated as a response.

Activating the Ignition-like Effect is not considered to be activating a card, so if you then activate the Ignition-like effect of "Fusion Gate", "Royal Oppression" can be used to negate the effect, but "Solemn Warning" cannot. This is because the effect of "Royal Oppression" states that it can negate the activation of effects, but "Solemn Warning" can only be used to negate the activation of a card.

Examples of Spell Cards with Ignition-like Effects: "Blaze Accelerator", "Frontline Base, "Fusion Gate", "Call of the Mummy", "Mass Driver", "Ritual of Grace" and "Valhalla, Hall of the Fallen".