Other legendary creatures you control have vigilance and "T: Add one mana of any color."
The Prismatic Bridge WUBRG
At the beginning of your upkeep, reveal cards from the top of your library until you reveal a creature or planeswalker card. Put that card onto the battlefield and the rest on the bottom of your library in a random order.
"I know this world, from canopy to roots." // Starnheim awaits.