All permanents on the battlefield (Ojer Taq as Ojer Taq).
You have a way to give an opponent's creature indestructible.
You have a way to deal damage to that creature equal to its toughness or greater.
You control at least two untapped artifacts.
An opponent controls an indestructible creature, or you have a way to give an opponent's creature indestructible.
You control a number of artifacts greater than two times the indestructible creature's toughness.
Steps
Give an opponent's creature indestructible by any method, if needed.
Deal damage to that creature at least equal to its toughness, using Ghirapur Aether Grid or any other method.
Activate Ghirapur Aether Grid by tapping two untapped artifacts you control, dealing 1 damage to the indestructible creature with lethal damage already marked on it.
Magmatic Galleon's second ability triggers, creating three 7/7 Treasure Dinosaur artifact creature tokens.
Repeat from step 3 any number of times.
Once you have infinite untapped artifact creature tokens, you may activate Ghirapur's Aether Grid any number of times, choosing any targets.
Give an opponent's creature indestructible, if needed.
Activate Ghirapur Aether Grid by tapping two artifacts you control, dealing 1 damage to an indestructible creature an opponent controls.
If the creature has less than 0 toughness, Magmatic Galleon's second ability triggers, creating three Treasure artifact tokens that become 7/7 Dinosaur creatures in addition to their other types as they enter.
Repeat from step 2.
Once you have infinite tokens, you may tap them using Ghirapur's Aether Grid to deal infinite damage to any target(s).