Body Dropper, Carrion Feeder, and Mortician Beetle:
Essentially serving the same purpose as "sac tanks", they can get unwieldly large far faster than your opponent could bargain for. At instant speed, they also have the opportunity to get some extra end-step advantage. However, they are very high-value targets for removal and have little to do on their own in the way of combat or target evasion. Body Dropper can also serve as an effective mana sink, should the draws come up dry.
Myr Servitor:
For grindy games, it can flood the board at a moment's notice. In general, for generic sac fodder is especially useful in color drought situations and the self-recursion makes for effective self-sustainability.
Forever Young and Crawl from the Cellar:
Cheap tools for graveyard cycling and sacrifice recursion. Cellar has the added benefit of making your Feeder grow even faster and the flashback ability keeps you busy on an empty draw. FY gets better the later and less frequent it shows up, but it can still keep you busy in a stale early game. Pit Keeper serves the same purpose.
Crash Through:
Gives your sac tanks some important damage potential when the time gets right. The cantrip secondary effect only serves to make it more versatile, but it is restricted in its potential use cases due to its sorcery speed, making it potentially more risky than it would be as an instant.
