Kargan Warleader

A Warrior lord in Boros is a curious color pairing for the effect, because the tribe has historically lived closer to red and black aggression than to white. Putting the anthem across two colors is the whole trade: a mono-colored lord would be cleaner to cast, but the split lets the card lean on white's ability to go wide and red's ability to close fast, and the 3/3 body swings for meaningful damage the turn after it arrives. The design detail worth sitting with is that the +1/+1 lands only on other Warriors, so a lone copy is just a vanilla three-drop and a board without a developed Warrior line gets nothing from it. That restriction is what forces the card into a committed build rather than a value slot; it rewards a board already tilted toward the tribe rather than seeding one, which is a different job than the cheaper single-color lords that also buff themselves and can anchor a curve on their own. This one asks the rest of the board to already exist. Its ceiling is set by how quickly you can flood the board beneath it, and its floor is a body that trades down against the removal it invites.