Deckbuilding is an important part of any TCG, so once you've tried out these options don't be afraid to make further alterations until the deck feels good to you.
Oftentimes this results in revealing your entire library, then shuffling it without getting a creature
Crop Rotation, Deadly Rollick, Culling the Weak, Diabolic Intent, Phyrexian Altar, Ashnod's Altar, and Phyrexian Tower all play a big role in how the deck takes shape, creating several loops where creatures are sacrificed for benefits like infinite ETBs, death triggers, mana, and so on
I am ignoring activated abilities and also making the assumption that all triggered abilities have targets and that the proper board state change has happened so that the first triggered ability can be triggered
It remains to be seen if Wizards will release more cards of such rarity in the future.