Psionic Sliver

Sliver design lives by the principle that any granted ability becomes a swarm-wide siege engine, and this is the lord that hands the whole tribe a damage cannon. The self-inflicting clause is the cost: each activation deals 2 to your target and 3 back to the firing Sliver, so the ability is a pinger that eats its own board if you fire indiscriminately. That tension is the entire point. A wide table of Slivers with high toughness becomes a wall of artillery that can clear small creatures and finish a player from afar, but a board of fragile 1/1 tokens self-immolates the moment you start tapping. Most Sliver lords stack stats or evasion or protection, effects that compound cleanly; this one grants reach into the air and across the table at the price of attrition the controller has to manage. It rewards a build that overloads on toughness so the pings outlast their own recoil, and it punishes the reflexive "tap everything" line that other ping engines invite. As a piece of tribal payoff it is unusually self-correcting: the more the deck commits to the gun, the more it has to plan around the muzzle pointing both ways.