Let's say I have just one ally on the field: Halimar Excavator. I play Rite of Replication (Including the kicker) and target HE. how do the 5 tokens interact with the etb trigger? How many cards get milled total this turn?
All six Halimar Excavators will see the five token Halimar Excavators enter the battlefield and will each trigger five times. You get thirty (30) triggers total, and each trigger that resolves will mill six cards, so in total you’d mill 180 cards.