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This is why I believe the Monstrosity could work whereas Sliv-Mizzet didnt

Whenever another creature enters, you choose one of three modes, put a +1/+1 counter on the Greeters, create a tapped Treasure token, or gain 2 life

Steel Overseer pairs especially well wit h Unwinding Clock, since you can use its effect four times in a full turn cycle, giving four +1/+1 counters to all your creatures by the time your next turn starts

Jungle Basin

This Horror also has an ETB to mill until you mill X dorks, so that'll fill out your graveyard with dorks and the rest'll head to the bottom of your library

If Infesting Radroach is milled at the same time an opponent mills a nonland card (for example, because of the activated ability of Raul, Trouble Shooter), Infesting Radroach's ability will trigger