Glissa, the Traitor: to recover the artifacts and potentially deal lots of damage/kill lots of creatures.
Perilous Myr: goes infinite with Glissa as long as there are creatures to kill and it's free if you have Heartless Summoning
Reaper of the Wilds: a nice damage dealer while also serving to tutor for Altar of the Brood if you already have the rest of the infinite combo as her scry ability can go infinite too.
Jarad's Orders: some tutor effects that are really needed here. You can get that creature you need while also tossing a Myr Retriever in the graveyard for later. Or just get two retrievers if you have the combo.
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