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Formidable Whenever you attack, if creatures you control have total power 8 or greater, target attacking creature you control fights up to one target creature you don't control

The ability to ignore black mana and instead use your life as a resource means that you can grant Krrik shadow via Dauthi Embrace for only 4 life, cast and attack with Skithiryx, the Blight Dragon for three mana and 6 life, while also casting your Whip of Erebos, Phyrexian Arena, and Grey Merchant of Asphodel in rapid succession

The other possibility is playing Invasion of Regatha in a dedicated burn deck since the backside seems pretty powerful with Play with Fire, Lightning Strike, and friends as a weird twist on Torbran, Thane of Red Fell, although I'm not sure a burn deck wants to use multiple burn spells or attacks to remove the five defense counters to defeat the battle

That being said, however, it is missing one key detail that could make it its own deck

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You can banish 3 cards from your Extra Deck face-down, then target 1 face-up monster on the field