If the creature you control already has a Role that you control attached to it, that Role will be put into its owner's graveyard as a state-based action after the Monster Role is attached to it but before the reflexive triggered ability resolves
If new Standard player looking to start a collection doesnt sound like you, whether that means youre not interested in Standard and/or you already have a collection, Id recommend taking a look at the full gallery of included cards and determining if the Starter Collection is worth it based on what you own and what you need
That seems unlikely, given that the much cheaper Porphyry Nodes sees very little play
This also helps make it more likely that youll have a body to attach any aura you draw to, even if its just a 1/1 token
As long as each token connects, you generate infinite combat steps, ETBs, and LTBs