Brackish Trudge
The recursion is what turns an otherwise disposable body into an engine piece: a 4/2 for three that enters tapped is aggressively priced but trades away easily, and the design pays that fragility back by letting the graveyard become a holding pen. The gate is the lifegain condition, and it does real structural work. You cannot buy the card back on demand; you have to have gained life this turn, which chains the Trudge to a lifegain shell rather than any random black deck. That coupling is the whole point. In a build already leaning on incidental life triggers (drain effects, lifelink attackers, food-style payoffs), the Trudge becomes a repeatable body that keeps coming back to feed sacrifice outlets or reload the board after a trade. Because it enters tapped, it is a proactive threat rather than a defensive one; the recursion refills the attack, not the block. Outside a lifegain context, the ability is dead text and you are left with a beater that taps down on arrival. This is a common-rarity build-around, the kind of card that means nothing in a vacuum and something specific in a deck constructed to satisfy its activation restriction: a low-rarity payoff pointing at the lifegain-aristocrats overlap rather than a card meant to stand on its own rate.
