Tengu format ruling
Supervise

Card effect (current official text)Equip only to a Gemini monster. It becomes an Effect Monster, and gains its effects. If this face-up card is sent from the field to the GY: Target 1 Normal Monster in your GY; Special Summon it.
Rulings
(C) Equip only to a Gemini monster. (1) It is treated as an Effect Monster, and gains its effect(s). (2) When this face-up card on the field is sent to the GY, select and Special Summon 1 Normal Monster from your GY.
- The (C) Condition cannot be negated.
- This card can be equipped to a Gemini Monster which has gained its effects.
- The (1) Continuous-like Effect does not activate.
- If Spell Canceller negates this effect, the equipped Gemini Monster can be 'Gemini Summoned'.
- The (2) mandatory Trigger-like Effect activates & resolves in the GY.
- This effect can activate in the Damage Step.
- This effect targets 1 Normal / Gemini Monster in the GY. You cannot target a non-Effect Fusion / Synchro Monster.
- This effect will still activates Dust Tornado destroys Supervise before it becomes equipped.
- If this card and the equipped Gemini Monster are destroyed together, you can Special Summon it.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.