Goat format ruling
Metamorphosis
Card effect (current official text)Tribute 1 monster. Special Summon 1 Fusion Monster from your Extra Deck with the same Level as the Tributed monster.
Rulings
- Metamorphosis does not properly Summon a Fusion Monster, so you cannot use Monster Reborn on it afterwards.
- Tributing a monster is a cost.
- You can Tribute a face-down monster.
- If you activated "Soul Exchange" targeting your opponent’s monster, if the monster is face-down, you cannot Tribute it as a cost for "Metamorphosis".
- If there is no monster with the same level as the Tributed monster in your Fusion Deck, then you cannot activate this card.
- Metamorphosis vs. A Legendary Ocean: if you want to Special Summon a Lv 6 Fusion Monster from your Fusion Deck, you have to Tribute a Lv 7 WATER monster on the field because it is treated as a Lv 6.
- Q: Can a player take an opponent’s monster through some card effect and then activate "Metamorphosis" if they do not have any Fusion Monsters of the same Lv Stars in their Fusion Deck? A: No. The player activating "Metamorphosis" needs a monster in their fusion deck that has the same number of Lv Stars as the monster that is being Tributed for the effect of "Metamorphosis."
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.