Tengu format ruling
Swallow Flip
Card effect (current official text)Negate the activation of an Effect Monster's effect that activates when a monster is Special Summoned (including itself), and destroy it.
Rulings
This card can only negate trigger effects which specifically activate when a monster is Special Summoned.
- It can negate the effects of cards like "Swap Frog", "Armageddon Knight", or "King Tiger Wanghu" (for all 3 examples, this card can only be activated when a monster is Special Summoned).
- It cannot negate Ignition effects, even if activated with ignition Priority. It can never negate the effect of "Substitoad", "Dark Grepher", nor "D.D. Crow".
- It cannot negate an effect which activated because a monster was Normal Summoned, even if that monster's effect states "if this card is Normal/Special Summoned".
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.