Boggart Harbinger

One of five tribal Shamans built on the same trade: a tutor that arranges your next draw instead of filling your hand, each fetching its own creature type and setting it on top for the following turn. The cost of that discount is tempo. You wait a turn for the goblin and you telegraph the hit to anyone reading your draw step. The upside is reliability of the highest order: a three-mana body doubling as "find any Goblin, and guarantee it's what you draw" is the connective tissue critical-mass tribal decks crave, the piece that turns a numbers-game strategy into a toolbox one. A lord to close the game, a sacrifice payoff, a one-of bomb that warps the board; the Harbinger finds it and delivers it on schedule. The 2/1 is almost incidental: it chump-blocks, it feeds death-matters triggers, and now and then it simply attacks. Top-of-library tutoring has always been black's instrument (Vampiric Tutor and its kin sculpt the draw rather than dumping cards into the open), and stapling that instrument to a creature that swells the tribe it searches is exactly the kind of compression black rewards. The on-top placement carries a quieter benefit too: the goblin sits in your library, out of reach of hand disruption, sealed until you've drawn it. A hand-tutor leaves the prize exposed; this one keeps it locked away until the turn it matters.