Not only is this a powerful Constructed card, I also see endless Commander possibilities due to its interaction with food
These cards tend to be pricey and for good reason
It does so little for 3 mana that I cant find myself ever wanting to play this, even if spirits were the most commonly played creature type in all formats
(To mill a card, a player puts the top card of their library into their graveyard.) 7.0/10$0.23 Atrocious Experiment Sorcery Target player mills two cards, draws two cards, and loses 2 life
Mana-Fixing Artifacts Cultivate, Farskeek, and both Manaweft and Gemhide Slivers help with Sliver Swarm's mana problems, but they're all contingent on drawing a green source of mana in your opening hand
But there are ways to put cards from your library in your graveyard, like with mill or entomb effects