Magma Sliver

Where most Slivers grant a static lord buff or a single keyword, this one hands the whole tribe a pump engine that scales with its own population: every Sliver can tap to dump a board-sized power boost onto one attacker. The math compounds in a way the keyword lords do not. Each additional Sliver both raises X and adds another activation, so the final modifier is the product of two numbers climbing together. A modest line of bodies turns one of them into a finisher capable of carrying lethal damage through a clogged ground stall. The catch is structural and elegant: every activation is a tap, so the team that powers the strike is the same team that wanted to attack or block. Funnel all that power into a lone creature and the rest sits tapped out, the swing one-dimensional, easy to fog or chump if the defender has an answer waiting. It rewards committing to the all-in alpha strike rather than a measured assault, which is the temperament a wide Sliver board tends toward anyway. Among the red lords it is the one built for closing rather than accumulating, the haymaker that converts a sticky, populous board into a single fatal arrow.