Ronin Warclub

That auto-attach trigger is the only reason this club ever sees the table. Equip 5 is a price you almost never want to pay, a deliberate brake telling you the warclub was not built to be slung around by hand. Instead it follows the board: each creature you play pulls the club onto itself, so the +2/+1 lands wherever the newest body shows up. That makes it most at home in a deck that drips out creatures one at a time, where the buff keeps relocating to whatever just hit the table and stays relevant turn after turn without an activation cost. The friction is real, though: a token swarm or a single big turn floods the trigger uselessly, since the club can only ride one creature, and a sacrifice or bounce effect that removes the equipped creature strands the buff until your next creature enters and bails it out. It is an early example of Equipment that automates its own attachment, a design idea that trades the player's control over targeting for a steady, hands-off engine; later cards picked the idea up, but this is among the first to make the relocation mandatory rather than optional. The lone Ronin imagery fits the mechanic, too: a masterless weapon that attaches itself to whoever steps up next.