Toxin Sliver

Deathtouch before deathtouch had a name. Years before the keyword was codified, this Sliver hands the entire hive the rule that any creature struck by Sliver combat damage dies and cannot be regenerated, which is functionally the lord-distributed version of what later became a one-word ability on a single body. The mechanical wrinkle is that it triggers on combat damage to a creature specifically, not to players, so it reshapes the entire board's blocking math rather than its clock: every Sliver in your army becomes a creature opponents cannot profitably block or attack into, and trades stop being trades. Because it cares about any Sliver dealing the damage, it scales with the tribe rather than with itself, the hallmark of the original Sliver design philosophy where one body upgrades the whole rather than acting alone. The "can't be regenerated" clause is the era-appropriate detail: in a format where regeneration shields were a live concern, stapling that onto the destruction closed a loophole that would otherwise have softened the effect against black and green creatures. A 3/3 for four is unremarkable on its own; the point is what it does to the rest of the hive, turning a swarm of small bodies into a wall that nothing crosses safely.