In Standard, I dont see anything remotely close to compelling enough for us to want this

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There were three cycles, one of two ally-color spells, one of two enemy-color spells, and one made up of multicolor spells, hitting all ten two-color combinations between them
Thats huge with cards like [[Cityscape Leveler]], where both cast and attack effects are relevant
Land Color tag templates(None) Otawara, Soaring City : Add
It also counteracts the downside of cards like Sleep-Cursed Faerie or Kitnap