I was just curious. Let's say I kicked a Rite of Replication to make 5 copies of the Halimar excavator. How many cards would that mill out? (assuming there is just a halimar excavator on the field to begin with.) Then let's say I twin casted the Rite of Replication how many cards would that mill out then? Assuming the same cards were out.
Five Allies are coming into play. Each will trigger their own ability, and each will trigger off the others as well, so each of them is triggering five times. In addition, the original Excavator triggers five times (assuming it's the same player controlling both the Excavator and the Rite). So you have six Excavators, each triggering five times, for a total of 30 triggers. When each resolves (assuming nothing happens to any of them in between), they count six Allies and mill six cards, for a total of 180 cards milled. Twincasting the Rite is a little different (obviously). When the Twincast resolves, it makes a copy of the Rtie. The copy resolves and all the above happens - 180 cards milled. Then the original Rite resolves and five more Excavators come into play. So now you have eleven Excavators, each triggering five times, each milling eleven cards, for 605 cards milled. So you get a grand total of 785 cards milled if my math is right. Which, frankly, seems like just a teensy bit of overkill.
