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Oviya does something very similar, allowing the player to put a creature or artifact onto the battlefield from their hand for the low cost of a single green mana, and subsequently gives any artifacts put onto the battlefield this way two +1/+1 counters

It gives you two options, each great

Would decks like Steelsong and Ruby/Amethyst return to the metagame

You can go on runs of not finding any Legendaries for tens of packs, or could even get three in one pack its all down to chance

Choose the White-Blue deck to take control of the gamecasting spells to stall your opponent while you fill the skies with a deadly swarm of creatures

If the manabase allows, Dimir can benefit greatly by dipping into Orzhovs toolbox for some additional stabilization and removal, although it already has access to a formidable suite of removal tools