The A-MAZE-ing Aage!

{2}{g}: Place a maze artifact token onto the battlefield.
Creatures must pay X mana to attack, where X
equals the number of maze tokens on the battlefield.
"Why build walls to keep you safe, when you could
build mazes to entrap your enemies? The wizard
Aage was wise and could weave the trees and forests
to create labyrinths to reflect his will."