The treasure is real, but so is the possibility of digging through 5,000 energy cards and finding nothing
Helm of the Host is the most recognizable combo here, which works with a number of other extra combat cards too
Then in your upkeep, for free, you can Raise Dead and return a Goblin card in your hand, so it's free recursion in your hand each turn, but not mana free to the battlefield
All you have to do is sacrifice your two Thopters to the Altar to gain four mana, then, with Nim Deathmantle equipped to Breya, sacrifice Breya to the Altar for a total of six mana
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