MTG Combo: Breya, Etherium Shaper + Eldrazi Displacer + Krark-Clan Ironworks

With all three permanents in play, pay the cost to activate Eldrazi Displacer targetting Breya. Breya will be flickered, bringing two thopters into play. The thopters can each be sacrificed for mana to the altar to generate a net gain of mana.

Breya can use this to generate infinite mana, the only resource she needs to use the Displacer to generate infinite tokens, and with both of those, infinite actviations of any of her abilities.

Ashnod's Altar + Breya, Etherium Shaper + Eldrazi Displacer is functionally identical.