Foul Emissary

Emerge asked you to sacrifice a creature to help pay for an oversized Eldrazi, and most enablers were pure chump bodies whose entire job was to die into something larger. This one was built to be a better corpse. Tribute it to an emerge spell and you don't just bank the mana discount, you get a 3/2 token in return, so the material you spent never really leaves the board. That turns a tempo-negative play (trade two cheap bodies for one expensive one) into something close to even on the battlefield while still pocketing the savings. The dig on entry hedges the plan when no emerge spell follows: look four deep, and if there's a creature you'd rather have in hand, take it. That's a conditional selection, not a guaranteed draw, so the body sometimes just smooths toward the payoff rather than replacing itself outright. Read as a pair, the two triggers are a complete thought about fueling a sacrifice-for-value engine: dig toward the payoff first, then become the cost without surrendering the material. Strip away the window where emerge spells exist and the second line goes dead, leaving a fragile 1/1 that only sifts the top of the library. That is the deliberate trade at the heart of it: a card engineered to be excellent alongside its host mechanic and near-inert without it, which is precisely how you keep an enabler from outliving the thing it was built to enable.