Tengu format ruling
Blazewing Butterfly
Card effect (current official text)This card is treated as a Normal Monster while face-up on the field or in the Graveyard. While this card is a Normal Monster on the field, you can Normal Summon it to have it become an Effect Monster with this effect.
● You can Tribute this card, then target 1 Gemini monster in your Graveyard, except "Blazewing Butterfly"; Special Summon that target, and if you do, it becomes an Effect Monster, and gains its effect.
Rulings
(U) This card is treated as a Normal Monster while face-up on the field or in the GY. (C) While this card is face-up on the field, you can Normal Summon it to have it be treated as an Effect Monster with this effect:● (1) You can Tribute this card to Special Summon 1 Gemini monster from your GY, except Blazewing Butterfly. A Gemini monster Special Summoned by this effect is treated as an Effect Monster, and gains its effect.
- The (U) Unclassified Effect applies on the field and in the GY.
- This effect can be negated while Blazewing Butterfly is face-up on the field, causing it to be treated as an effect monster.
- The (C) Condition cannot be negated. This is not an effect.
- The (1) Ignition Effect activates & resolves on the field.
- This effect targets a Gemini monster in your GY. It will be negated by Necrovalley.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.