I was playing against a kid on dueling network and he swore that this play wasn't legal and I pretty much just ended the match to avoid arguing. I know I might be wrong, but here's how it went (basically OTK cause he had no Effect Veilers, Battle Faders & only 2 cards on backrow which he didn't activate):
In my hand I had 2 Galaxy Eyes Photon Dragons. On the field I had Red Eyes Darkness Metal Dragon (I'm going to write REDMD for short) & Lightpulsar Dragon.
I special summoned Galaxy Eyes Photon Dragon tributing REDMD & Lightpulsar. Since they technically should both go to grave together I special summoned REDMD using Lightpulsar's effect.
I special summon Lightpulsar using REDMD effect.
Special summon another Galaxy Eyes from hand, again special summon REDMD using Lightpulsar's eff, then special summon Lightpulsar.
Overlay for Heiratic Overlord, detach one, tribute REDMD first (important) & then Lightpulsar to pop his backrow. Lightpulsar effect I special summon REDMD again, REDMD special summon Galaxy Eyes photon & attack for OTK.