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With two Heartless Summoning, Simulacrum is free to cast, fetches a land, and replaces itself immediately. With Athreos out, you can force people to make the hard choice of 3 life or not too. If you have Academy Ruins out and 2 Simulacrum (or even just 1 in the grave), for 2 mana, you can loop him around twice. With only 2 Myr Retrievers and Heartless Summoning, you have an infinite loop of sac effects, which you can abuse with Altar of the brood (infinite mill), Bitter Ordeal (infinite deck exile), River Kelpie (draw your deck) and Athreos. Tutor your Altar with Trinket Mage.
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