The card was definitely printed with card Lucky Dime in mind, a seven-cost item that can act as a doubler for your Tamatoas in play
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Kosei, Penitent Warlord makes up for that when you assemble a trio of mods onto it: an aura, an equipment, and a counter (+1/+1, -1/-1, keyword, whatever)
Its also a lot harder to counter three separate cheap cantrip spells than it is to counter one big, costly spell
While theres something to praise in both the speed and expanded scope of the B&R solution to Omnath which attempted to deal with underlying enablers as well as the card itself I still find myself questioning how it got to print
The real appeal is its powerful abilities, starting with its ability to tap for two mana of one color to cast those expensive Hydras sooner