And They Shall Know No Fear

White protection in an instant shell, but bolted to a tribal chassis. Where a card like Rootborn Defenses blankets your whole board with indestructibility and adds a token, this narrows the umbrella to a single creature type and folds in a marginal +1/+0. That narrowing is the design tension in miniature: on a scattered board it whiffs on half your creatures, but in a deck built around one type it becomes a two-mana fog-plus-alpha-strike, walking your team through a board wipe and swinging back the same turn. The choose-a-creature-type clause is doing quiet work, because it is not locked to your own tribe; you can name whatever line happens to be on the battlefield, which lets it function as a plain combat trick even in a deck with no tribal ambitions at all. Instant speed is the load-bearing part. Held up through an opponent's Wrath of God or a well-timed block, it turns the most decisive board state into a non-event, and indestructible answers the widest class of removal white gets to interact with at this cost. The flavor and the effect line up cleanly: a chosen legion refusing to break, standing where lesser troops would rout.