Emrakul's Messenger

The trigger is the tell: this rewards decks already built to draw two cards a turn, not decks that must bend to do it. The "second card each turn" condition asks for an overlap two archetypes rarely share, the tempo-flyer aggro deck and the low-curve card-advantage engine, and it staples a colorless mana source onto that seam. Each Eldrazi Spawn is a 0/1 that sacrifices for one colorless mana, so the reward is not board presence but ramp: a stream of one-shot mana producers generated by doing something the deck wanted anyway. That is the quiet ambition here. A 2/1 flyer for two is a fine evasive body on its own, but the Spawn engine points somewhere else entirely, toward Eldrazi payoffs and colorless-mana sinks that a cheap flyer has no business enabling. The type line and devoid do the connective work together: this is literally an Eldrazi, so it feeds cards that count Eldrazi creatures, and devoid strips its color so it registers as colorless for anything checking that. The design bet is that the double-draw trigger fires most turns in a deck with cantrips and cheap card draw, without deckbuilding contortion, yet remains a real condition you can fail to meet. It is a bridge piece: a creature that asks a tempo deck whether it would like to be a ramp deck too, and hands over the mana to find out.