Reed Richards, The Maker

Reach, menace
-Children of Tomorrow- Skip your next turn: At the beginning of your next upkeep, create The City, a Legendary Artifact with Ascend and "At the beginning of each of your main phases, create a 1/1 Construct creature token."
-Constructs you control get +3/+3 if you have the city's blessing.
-When Reed leaves the battlefield, if you control an artifact named The City, each player makes a copy of it.