Zahid, Djinn of the Lamp

The lineage runs straight back to Palinchron and the old "tap an artifact, pay a cheaper cost" Djinns: a 5/6 flyer printed at six mana but built to land on turn four if you have an artifact to tap and the floor of to spend. That alternative cost is the whole pitch. In a vacuum a six-mana 5/6 with no evasion-relevant text beyond flying is unremarkable; the reason this body matters is that the artifact-tap clause lets it skip ahead of its curve in any deck running enough early artifacts to feed it. The tap is the cost that keeps the discount honest: the artifact has to be untapped, so you cannot cash in a creature you needed for a different activation that turn, and you only get the rate once per cast. What makes the design durable is that it scales with the artifact density of whatever shell it joins rather than asking for a dedicated build: a Treasure, a Signet, a Mox-style rock, any one of them turns this into a serious early threat. It is a clean modern reprise of a recurring blue idea, that a big flyer should arrive faster than its mana value when you have artifacts to leverage, and the 5/6 body is sized exactly to survive the removal a four-mana threat tends to draw.