Let's imagine that I have one precursor golem with his buddies in play and my opponents control a combined 7 creatures.  I cast mirroweave targeting a golem.  It's copied for each of the other golems, but I stack things so it resolves with all creatures on the battlefield as copies of precursor golem.  Assume there are 10 total creature to begin with.  I cast an unkicked Rite of Replication...

"that player copies that spell for each other golem that spell could target" #1

...

"that player copies that spell for each other golem that spell could target" #10

"Put a token onto the battlefield that's a copy of target creature"

This turns into

"Put a token onto the battlefield that's a copy of target creature" #1

...

"Put a token onto the battlefield that's a copy of target creature" #9

"that player copies that spell for each other golem that spell could target" #2

...

"that player copies that spell for each other golem that spell could target" #10

"Put a token onto the battlefield that's a copy of target creature"

9 precursor golems enter the battlefield, each bringing 2 buddies.  There are now 19 precursor golems and 18 3/3 generic golem tokens.  We STILL have

"Put a token onto the battlefield that's a copy of target creature" #1

...

"Put a token onto the battlefield that's a copy of target creature" #36

"that player copies that spell for each other golem that spell could target" #3

...

"that player copies that spell for each other golem that spell could target" #10

"Put a token onto the battlefield that's a copy of target creature"



Precursor Golems/Golem Tokens
Initial Golems : 10/0
1:  19/18
2:  37/54
3:  73/126
4:  145/414
5:  289/990
6:  577/2142
7:  1153/4446
8:  2305/9054
9:  4609/18270
10: 9217/36702
Original Spell: 9218/36704
When Mirrorweave wears off you will have 9209 Precursor Golems and 36706 3/3 Golem tokens that will all be killed 9209 times by any kill spell that targets a single creature.

: D

This is when there are only TEN creatures on the battlefield, and requires only 8 mana.

TLDR; Mirrorweave + Precursor Golem + Rite of Replication = A LOT of tokens.

The combo comes out fairly effectively, especially if I can get out my extraplanar lens.  The deck seems to frighten other players, though I don't play with it to win.  I play to make as many tokens as possible (current record is somewhere above 10^46000).  Needs updating.