Activate Ashnod's Altar by sacrificing Fearsome Goblin Pair, adding {C}{C}.
When Fearsome Goblin Pair dies, it and Nim Deathmantle trigger,
Resolve the Fearsome Goblin Pair trigger, creating a 0/0 Goblin Army creature token and putting four +1/+1 counters on it
Holding priority, activate Ashnod's Altar by sacrificing the Goblin Army, adding {C}{C}.
Resolve the Nim Deathmantle trigger, causing you to pay {4} to return Fearsome Goblin Pair from your graveyard to the battlefield and attach Nim Deathmantle to it.
Repeat.

Infinite ETB

Infinite LTB

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