Obsidian Battle-Axe

The auto-equip clause is the whole engine: most Equipment forces a turn and a tax to relocate, but here every Warrior that hits the battlefield can volunteer for the axe at no cost and no timing window. That trigger reframes the card from a per-creature investment into a tribal anthem that follows the board, redirecting +2/+1 and haste to whatever just arrived. Haste is the load-bearing keyword. A Warrior aggro deck wants its threats attacking the turn they land, and an Equipment that hands out haste on entry turns a developing board into immediate pressure: the new creature is hasty and pre-buffed before the equip cost ever comes up. The steep equip of three is what keeps the card honest outside its tribe, since manually moving the axe is deliberately expensive; you are meant to let the trigger do the relocating and spend mana on more Warriors instead. It belongs to a lineage of cheap equip-package payoffs built to reward going wide on a single creature type rather than suiting up one champion, a design that trades raw rate for the consistency of always landing on a fresh attacker. Outside a Warrior shell it is a clumsy, overcosted buff; inside one it is a self-attaching anthem that asks only that you keep deploying bodies.