City of Thanatos

Hexproof
City of Thanatos comes into play tapped.
{t}Add {u}, {b}, or {w} to your mana pool.
If you control Wilds of Thanatos, Thanatos
Mage College, and City of Thanatos all
permanents that tap for mana may tap for
whatever colors you wish, and for three times
the amount they normally tap for.