Markov Crusader

The conditional haste is the whole design conceit: a five-mana 4/3 with lifelink is a fine body but a slow one, and the rider only earns its keep inside a deck already running on Vampire density. Control another Vampire and it swings the turn it lands, turning a four-power lifelinker into a life total that snowballs fast; cast it into an empty board and it still gains you life on the crack-back, just not on its own terms, because the attack has to wait a turn it would rather not waste. That dependency is the cost the printing pays for the haste: the ability is free in name but expensive in deckbuilding, since it asks you to have already committed to the tribe before this card does anything extra. The lifelink end of the equation matters more in a swarm than in isolation, where a tribal aggro shell wants to convert combat damage into a cushion against the mirror and against burn, and a hasty four-power attacker gaining four every swing does exactly that. Built for a Vampire aggro deck and faintly inert outside one, it is a clean illustration of payoff design that lives or dies on the rest of the list: the body is replaceable, the haste rider is not, and the rider only fires when the deck around it is already doing its job.