All permanents on the battlefield (Dinosaur without a +1/+1 counter on it).
Notable Prerequisites
Blue has a -1/-1 counter on it.
Steps
Activate
Goblin Bombardment by sacrificing the other Dinosaur.
When the Dinosaur dies, its undying ability triggers, returning it from your graveyard to the battlefield without a +1/+1 counter on it due to the -1/-1 counter it will gain from
Blue.
Resolve the
Goblin Bombardment ability.
Repeat.
Notes
The chosen Dinosaur must not be a Human for the combo to work. Notably, this means you cannot use a creature with changeling for this combo.
Results
Infinite LTB.
Infinite ETB.
Infinite sacrifice triggers.
Infinite death triggers.
Infinite damage.
Metadata
In 0 decks according to EDHREC.
Bracket Tag
This combo has been estimated to be Exhibition (Bracket 1+).