This deck is built around the interaction between Heartless Summoning and Myr Retriever. Shred Memory acts as copies 5-8 for both, as transmute allows both to be searched. Also Shred Memory can be hard cast to "deal" with dredge
Heartless Summoning makes Myr Retriever free and kills it, putting it in the graveyard. Then play another, return the first to your hand and you have an infinite combo.
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