Darkslick Drake

The four toughness is the design fulcrum here, not the card draw. This flier holds back almost everything an early aggressive curve throws at it: it eats two-power attackers, survives most damage-based removal and toughness-targeting effects, and only trades down to a much larger flier or a card the opponent spends specifically on it. That defensive bulk is what makes the death trigger comfortable rather than wishful. A smaller body with the same clause invites a free chump or a cheap burn spell to cash the trigger on the opponent's terms; here, the toughness forces them to commit a real answer, so the replacement card arrives only after they have already paid for it. The result is a creature with no clean line to play around. Attack into it and it kills your attacker without dying; ignore it and it walls the air indefinitely; spend removal on it and it cantrips out of the slot. This is the blue defensive body that refunds itself on death, the structural promise that lets a card sit in a deck without ever feeling fully dead: you pay a premium over a vanilla flier for the guarantee that the slot keeps working whether the creature lives or dies. Workmanlike rather than flashy, which is exactly the assignment.