Blazing Sunsteel

This takes Boros Reckoner's redirect trick and puts it on an Equipment, and the change of chassis is the whole point. Reckoner had to be the creature getting hit; here, the damage-reflection rider travels wherever you bolt it, so any body becomes a mirror that answers combat, burn, and even its own controller's Star of Extinction with a matching shot at any target. The multiplayer scaling is the design tell: +1/+0 for each opponent you have means the offense grows the more players sit across from you, and the redirection clause turns every point of damage the creature soaks into a bolt you aim. Feed it a large incoming hit and it becomes a removal spell paid for by an attacker; wrath the board and the equipped creature can still answer with the wrath's worth of damage as its trigger resolves, even after it dies. The tension is that it does nothing on empty air: it needs damage dealt to the equipped creature to fire, so the pilot has to court combat, wield a damage source, or run into a sweeper on purpose. The equip of four is the counterweight, keeping this from being a free trigger you re-suit turn after turn. What it borrows from the redirection lineage it repackages as a portable engine, and the opponent-count clause baked into the power bonus is the tuning that aims it at a table rather than a duel.