If your deck does not have access to green, you might have to get more creative by using cards like Tithe, Pilgrims Eye, or even Demonic Tutor to put lands into your hand, cards like Mana Geyser, High Tide, or Caged Sun to get a big payoff, or mana rocks like Arcane Signet, Coalition Relic, and the Ravnica Signet cycle (Boros Signet, Izzet Signet, etc.) to speed things along at the risk of seeing them destroyed later
you also get a copier effect for six mana, thats repeatable every turn
This creature can do 3 damage to each non-white creature, which should be enough to remove a ton of threats from the battlefield
There arent enough of those cards to flesh out an entire theme yet, and they didnt even include many of the best cards that work in this space
Commander preconstructed decks have been notorious for having far too many taplands once they go above two colors