Marauding Raptor has:
Whenever another creature enters the battlefield under your control, Marauding Raptor deals 2 damage to it. If a Dinosaur is dealt damage this way, Marauding Raptor gets +2/+0 until end of turn.
Enrage - Whenever Polyraptor is dealt damage, create a token that's a copy of Polyraptor.
When my opponent had Marauding Raptor in play, and played a Polyraptor, the Marauding Raptor deals two damage to the original, then when a token copy was made the Marauding Raptor dealt to that, which makes another copy, which is also dealt damage, etc...
My question is, does this mean the game breaks and is over, or does the arbitrary loop stop of its own accord at some point?
(Neither of us were able to destroy or exile a Polyraptor token in response to the damage, to stop the loop.)