In that case, the Sentinel enters from the stack, not the graveyard
Here are some incentives for it: Cards like Corrupt, Cabal Coffers, Mutilate, and Defile want you to play as many swamps as possible, so their efficiency is maximized in mono-black decks
This means its easy for a Choco deck to go wide, and therefore get a lot of benefit out of its ability
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We've had players suggest that we mix it up and have themes or variations, like Planechase or 2-Headed Giant, but I've been hesitant to do that outside of casual play
Not only are there plenty of cards to choose from, but there are also three distinct strategies to build around