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Tazri, Beacon of Unity is solid, but with only a handful of Party cards in red and green, five-color really isnt necessary
There's no need for a sideboard, you might edit your deck between matches but you never have the opportunity to use them against the same opponent
Using a Commander like that also makes it very easy to include combos that let you sacrifice a permanent as many times as you want in a turn
The Archetype is built around Normal Monsters that can be easily equipped with their in-Archetype Spell Cards that can only be put on Normal Monsters
There are some other general things that are important to consider, however, the two points Ive made here should give you a broad enough outlook that we can hit the ground running