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Marrow-Gnawer is no joke, there are 5,210 Commander decks with her at the head on EDHREC.com
It's also possible to build a Zinnia Commander deck to maximize enter effects, and here's a few cards to help begin that process: Panharmonicon - this four-mana artifact has a static ability that says if a creature or artifact entering would trigger an ability of a permanent controlled by the player, that triggers twice instead
Lets move right ahead to trying to take advantage of our graveyard in a more proactive fashion: Creatures (36) 4 Llanowar Elves 4 Merfolk Branchwalker 2 Ghalta, Primal Hunger 4 Steel Leaf Champion 4 Stitcher's Supplier 4 Nullhide Ferox 4 Glowspore Shaman 4 Charnel Troll 4 Pelt Collector 2 Plaguecrafter Lands (24) Sideboard Running 36 creatures and 24 lands isnt often right, but Charnel Troll is a huge payoff for hitting a lot of creatures with Stitchers Supplier, Glowspore Shaman, and Merfolk Branchwalker
As second commander option, we have Eris, Roar of the Storm
It's really strong on your foe's upkeep after untapping, before drawing, on the only land of a certain color to lock them out of that color this turn, while drawing you a card