Tengu format ruling
Embodiment of Apophis

Card effect (current official text)During either player's Main Phase: Special Summon this card as a Normal Monster (Reptile-Type/EARTH/Level 4/ATK 1600/DEF 1800). (This card is also still a Trap Card.)
Rulings
- Once "Embodiment of Apophis" has been activated, it takes up 1 Monster Card Zone and 1 Spell & Trap Card Zone. The physical location of "Embodiment of Apophis" should be on the Monster Card Zones, however.
- If your Monster Card Zones are all full you cannot activate "Embodiment of Apophis". If your Spell & Trap Card Zones are all full you cannot take control of your opponent’s "Embodiment of Apophis" because you will need 1 Monster Card Zone and 1 Spell & Trap Card Zone for it.
- If your opponent has no vacant Spell & Trap Card Zones, you cannot give them "Embodiment of Apophis" for "Creature Swap". If "Embodiment of Apophis" is your only monster in such a case, neither player can activate "Creature Swap".
- You can activate "Embodiment of Apophis" during your opponent’s Main Phase, or your own.
- vs. "Jinzo": If "Emodiment of Apophis" is a monster, and "Jinzo" or "Royal Decree" is played, "Embodiment of Apophis" cannot remain as a monster and is placed face-up in the Spell & Trap Card Zone, where it remains on the field meaninglessly (even if "Jinzo" leaves play later). If "Royal Decree" is chained to the activation of "Embodiment of Apophis", the effect of "Embodiment of Apophis" is negated and it remains on the field in the Spell & Trap Card Zone meaninglessly.
- If "Embodiment of Apophis" attacks a face-down "Jinzo", once "Jinzo" is flipped face-up, "Embodiment of Apophis" reverts to a Trap Card. Damage calculation is not applied.
- If "Embodiment of Apophis" is a monster, and is flipped face-down, it goes back to the Spell & Trap Card Zone as a Trap Card (vertically, since Trap Cards do not have battle positions). You cannot activate "Embodiment of Apophis" that same turn, because it is a Trap Card that was just Set.
- If your opponent controls your "Embodiment of Apophis" as a monster with "Snatch Steal" or "Creature Swap", and it is flipped face-down, it goes to your opponent’s Spell & Trap Card Zone because he is the controller.
- "Embodiment of Apophis" is considered a Normal Monster. It does not inflict damage for "Ceasefire". You can use "Delta Attacker" if you have 3 "Embodiment of Apophis" monsters. You can Tribute "Embodiment of Apophis" for "Sword of the Soul-Eater" while it is a monster.
- "Embodiment of Apophis", while a monster, has original ATK 1600 and original DEF 1800 (for purposes of "Megamorph", etc.).
- When "Embodiment of Apophis" is Special Summoned, you can activate "Torrential Tribute" just like with any other Summon.
- You can use "Chain Destruction" when "Embodiment of Apophis" is Special Summoned, and "Chain Destruction" will destroy all copies of "Embodiment of Apophis" in the hand and Deck even though they are Trap Cards.
- You can use "Embodiment of Apophis" as a Tribute once it is a monster. You cannot Tribute it for a Ritual Summon, etc., while it is in your hand.
- If "Embodiment of Apophis" is a monster and "Morphing Jar #2" is activated, "Embodiment of Apophis" is shuffled into the Deck as a Trap Card, so it does NOT count towards the number of monsters you need to pick up. (Also, if you pick up "Embodiment of Apophis" for the effect of "Morphing Jar #2", it is not counted as a monster and will be one of the cards sent to the GY.)
- If you pick up "Embodiment of Apophis" for "Cyber Jar", it is added to your hand.
- If "Embodiment of Apophis" is a monster and is equipped to "Relinquished", "Embodiment of Apophis" is treated as any other monster equipped to "Relinquished", and "Relinquished" gets 1600 ATK and 1800 DEF.
- If "Embodiment of Apophis" battles "D.D. Warrior Lady" and her effect is activated, both will be removed from play.
- If you select "Embodiment of Apophis" as your monster for "Last Turn", it is not sent to the GY even though "Last Turn" sends all other cards to the GY.
- If you control "Theban Nightmare" and "Embodiment of Apophis", you control a Trap Card so the effect of "Theban Nightmare" cannot be applied.
- If you change "Embodiment of Apophis" to Machine-Type and use "Limiter Removal", then "Jinzo" is Summoned later that turn and "Embodiment of Apophis" switches back to a Trap Card, "Embodiment of Apophis" is not destroyed in the End Phase by "Limiter Removal".
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.