Jace, Guildpact of Ravnica

At the beginning of your end step, if you control
a permanent of each color combination, you win
the game.
At the beginning of your first main phase, if you control five or more Gates, add {w}{u}{b}{r}{g}. Use
this mana only to pay colored mana costs.
At the agreement of the ten Guild leaders, Jace
became the embodiment of law on Ravnica. What
words he utters are final and binding.