I don't know how much play this will see outside of a few niches, but shadow is a powerful ability (that not many creatures have), so it's cool to see
In the command zone, he's likely to have the same problem as my mono-black Sheoldred deck
Damage is dealt either by creatures or by spells
Getting your choice of removing one creature or debuffing all creature tokens in play is a modal spell worth taking
7 Hydroid Krasis Triple The Creature Types Blue and green decks love doing two things, making mana and drawing cards, and with Hydroid Krasis, you can do both while throwing in a little life gain on top
Zodiark, Umbral God Embrace the blackness and get Zodiark who is an undeniably indestructible, mass murdering threat to the game