Vampire Envoy

The 1/4 flying body is the giveaway: this was built to block first and gain incidentally, not to attack. The lifegain trigger keys off becoming tapped rather than attacking, and that divorce of payout from combat is the whole structural point. Most lifegain creatures from this kind of slow-grind design ask you to swing or sacrifice; here, any tap will do. Crew a Vehicle, pay a convoke cost, feed it to an artifact that taps creatures, or simply attack into a board where the flyer goes unblocked: each tap returns a life. The effect tops out at a trickle, so it never threatened any format and was content to fill a defensive curve slot. Its real home is anywhere "tapped" can be manufactured cheaply and repeatedly, where one life per tap stops being incidental and starts approximating an engine. The Ally type and the Cleric line gesture at the tribal subthemes of its era, but the card's actual identity is mechanical: a durable evasive body whose lifegain answers to tapping rather than to fighting, a wrinkle rarer than the modest rate suggests.