Legion Vanguard

Explore was designed as a green-white card-advantage keyword, a way to smooth draws and grow a creature on the same trigger, born on the plane where it debuted. Handing the mechanic to black on a repeatable sacrifice outlet quietly changes what it is: instead of a one-time value bump stapled to entering the battlefield, explore becomes the reward at the tail of a sacrifice engine. Feed it a body, dig for a land or a counter, and the nonland-reveal choice (keep it on top or bin it) turns into a selection tool you fire at will. The repeatability is what does the work. Aristocrat decks already spawn creatures to throw at drain and death triggers, and this converts each of those into filtering and a slowly growing clock, at instant speed, capped only by your mana and your supply of fodder. The 2/2 for two is deliberately plain: the card is not asking to be cast for its stats, it is asking to be the outlet you leave parked on the board while your fodder-generators do their thing. What separates it from a vanilla sacrifice payoff is the land-versus-counter fork, which lets a single activation refill your hand when draws run dry or thicken a threat when they don't. It is a role player for a long-established archetype, wearing a keyword that almost never shows up in black.