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Use the Ashnod's Altar to sacrifice the Myr Retriever for [2]. When the Myr Retriever hits the graveyard, use him to put another Myr Retriever back into your hand. Cast the recovered Myr Retriever with the {2} you got from sacrificing the previous Myr Retriever. Use this sacrifice/retrieve/cast engine to trigger various ETB and LTB effects of the critters and enchantments in the deck to build a massive token army, drown them in +1/+1 counters, and deal damage directly to your opponent. Wash, rinse, repeat.
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