The rules for layers are notoriously tricky, but in almost all cases you apply the copy effect BEFORE other stat changes, meaning lingering buffs from triggers will boost its new power too
When you pay this cost one or more times, put that many +1/+1 counters on Spectral Adversary, then up to that many other target artifacts, creatures, and/or enchantments phase out
For the bigger picture, tokens are one piece of a complete deck see our step-by-step Commander deckbuilding guide and the commander staples every deck wants
With Koby in the list, the deck has an even stronger early game, letting you KO low-cost Characters and even gain a card draw
Ill be keeping an eye on the new releases and picking a new one soon
If you are "set complete" for both Alchemy and the adjacent Standard set, normal duplicate protection rules apply