Underworld Coinsmith

A drain engine welded onto a lifegain engine, with each half feeding the other. Every enchantment that enters under your control ticks your life up by one, and the activated ability spends that stored life back out to bleed the whole table; the same currency cycles between your total and your opponents' faces. Because the trigger keys off the battlefield rather than the stack, it catches more than hardcast enchantments: an enchantment token stamped out by another engine, a blinked aura returning, an enchantment creature flickering back all pay the same toll. The catch is the extra life payment stapled to the drain: without a steady stream of enchantments refilling the reservoir, the ability eats into you as fast as it eats into them. That is what keeps a two-drop from being a freeroll. It wants a board thick with permanents to subsidize the bleed, which is precisely the kind of shell a White-Black enchantment deck tends to assemble anyway. The Cleric body is incidental; what the card really wants is a battlefield full of things that stick around rather than spells that resolve and leave. It sits low on the curve, where the incremental lifegain compounds hardest, an engine that grinds opponents out horizontally without ever needing to attack to close.