You always start the game with your combo piece in hand, and the format has so many threats to cheat in besides the Ripper: Patron of the Vein, Markov Enforcer, and Crossway Troublemakers are just a few of the big vamps that this Rakdos commander puts into play unreasonably early
The additional text here is that it costs one mana less to cast for each creature card in your graveyard, and it can be as cheap as one Black mana
Green has loads of in-color synergies that work, and you don't even need to do this as a sorcery, so you can wait until the end of someone's turn, tap out and discard a card and dig up something nice and toss it onto the battlefield
Champion of Lambholt was the immediate card to watch for us, as effects that say your opponents cant and dictating how combat goes in a mostly combat reliant power level is something we should be aware of
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Can I open Pokmon packs online for free