Blood Operative

Most graveyard hate hits the battlefield once and stays put: one exile, a body that trades, and then a vanilla creature for the rest of the game. The recursion clause here is the whole point of the design. Tie the body to surveil (a mechanic that fills your own graveyard as a matter of course) and the card stops being a one-shot answer and becomes a repeatable one, climbing back to your hand every time you dig. The 3-life payment is the brake: each return costs real resources, and the lifelink on the front half pays you back across attacks, so the engine funds itself rather than bleeding you out. The exile is a may, which matters more than it looks; the trigger only fires when this hits the battlefield, so the optional clause is there to keep you from being forced to exile a card you would rather leave alone (your own flashback fuel, say) when the only target on the table is your own graveyard. The result is a hatebear built for a self-mill shell rather than a sideboard slot, a creature that punishes graveyard strategies while quietly being one itself. It asks you to want the surveil engine for its own sake, then hands you a recurring assassin that keeps coming back as long as you keep paying.