Kaseto, Orochi Archmage

Snakes had spent most of the game's history as a creature type long on flavor and short on any mechanical thread; this commander hands them one in the simplest possible form. The engine is a repeatable mana sink: two mana makes a creature unblockable, and if that creature is a Snake it swings for two more. The targeting is what defines the design. The ability can point at any creature, yours or an opponent's, which means the unblockable half is not gated behind a Snake shell at all. In a blue-green deck it functions as a finisher for any single fat threat you want to shove through a clogged board, and the +2/+2 rider is the lure that gives the generic enabler a tribal shape rather than the other way around. No built-in card advantage does the balancing: at two mana per activation, the ability wants a mana base with excess to dump into the same creature turn after turn, so it scales with the game instead of dominating it early. This sits alongside the other commanders designed to give a neglected creature type a reason to exist on its own terms, handing Snakes the kind of repeatable payoff that better-supported tribes had enjoyed for years.