Pretty simple questions... with Feldon of the Third Path creating creature tokens until the end of the turn, what happens if/when they are mutated into another creature? To not lose the creature token, does it matter if it gets mutated on top or bottom? Say I'm casting Porcuparrot for it's mutate cost, with a Feldon-copy of Utvara Hellkite on the BF as it's target, can I have the Hellkite on top and still keep it? What if it's on the bottom (where I'm assuming I can keep it for sure), and the next turn I make a new copy of the Hellkite... can I pay to mutate it into the Porcuparrot again, and have two instances of the Hellkite in the mutated creature, triggering twice when a dragon attacks, or is this strictly an alternate casting cost? Like, can you add non-mutate creatures into the mutation after the creature with mutate has already been cast? Or can you only add creatures with mutate to the mutation stack by casting them from your hand? What if I'm using Feldon to copy a creature with mutate... can I pay to have it mutate with another creature...?
At the beginning of the next end step, Feldon's delayed triggered ability will trigger and make you sacrifice the token he created - even if the token was mutated, even if the token itself is not the top card in the mutated "pile", it is still it as far as the delayed trigger cares.
603.7c. A delayed triggered ability that refers to a particular object still affects it even if the object changes characteristics.
You can only add creatures to the "pile" by casting a creature for its Mutate cost. There is absolutely no way to add the second token to the pile. And Feldon creates a token directly on the battlefield, the token is not being cast so even if there is a Mutate cost on the original card, you can't pay it.
Say I'm casting Porcuparrot for it's mutate cost, with a Feldon-copy of Utvara Hellkite on the BF as it's target, can I have the Hellkite on top and still keep it? What if it's on the bottom (where I'm assuming I can keep it for sure), and the next turn I make a new copy of the Hellkite... can I pay to mutate it into the Porcuparrot again, and have two instances of the Hellkite in the mutated creature, triggering twice when a dragon attacks, or is this strictly an alternate casting cost?
From what I read on wiki, when you sacrifice the token you created with Feldon's ability at EOT, you must sacrifice the creature with Mutate that you attached to the token as well. In your case, you sacrifice bothHellkite's token and Porcuparrot, no matter which is on top.
It's not among the questions you ask but it seems useful to clarify. Please correct me if I'm wrong about this.
You can only add creatures to the "pile" by casting a creature for its Mutate cost. There is absolutely no way to add the second token to the pile. And Feldon creates a token directly on the battlefield, the token is not being cast so even if there is a Mutate cost on the original card, you can't pay it.
From what I read on wiki, when you sacrifice the token you created with Feldon's ability at EOT, you must sacrifice the creature with Mutate that you attached to the token as well. In your case, you sacrifice both Hellkite's token and Porcuparrot, no matter which is on top.
It's not among the questions you ask but it seems useful to clarify. Please correct me if I'm wrong about this.
https://mtg.gamepedia.com/Mutate