Command Tower (Minas Tirith)

{t}Add one mana of any color in your
commander's color identity.
"But Minas Anor endured, and it was named
anew Minas Tirith, the Tower of Guard; for
there the kings caused to be built in the citadel a
white tower, very tall and fair, and its eye was
upon many lands. Proud still and strong was
that city, and in it the White Tree still flowered
for a while before the house of the Kings."
― The Silmarillion, "Of the Rings of Power and
the Third Age"