It doesnt have a ton of financial upside, but its likely to be at least marginally useful for a very long time
As with other transforming double-faced cards, it's important to remind ourselves that the cards characteristics color, mana value, type are whats printed on the front face , and if the card leaves and returns to the battlefield, it returns on its front face
Legendary affects rules like deckbuilding and the legend rule, while the creature types matter for typal synergies and card interactions
That said, Tatsunari can only be used in Commander decks that are black, blue, and green, as its activated effect can be paid for with either blue or green mana
Divine Resilience Saving your Creatures from removal can be key for winning, especially if that Creature is enabling your deck in some way or providing value through drawing cards or tampons ng lands
Your reanimation should be even deadlier with nothing on board to contend your creatures