Jace, Master of Ravnica

Eminence-At the beginning of your upkeep choose a guild, the watermark of target land becomes the watermark of the chosen guild.
Lands with a guild watermark you control gain, {t}: Add to your mana pool one mana of any type the guild of the land's watermark could produce.
Whenever a land enters the battlefield, untap it.
"I am more than the guildpact, I am more than the guilds, I control them all"