Sigurda's Bassilica

{t}: Add {c}.
-When this land enters the battlefield, pair it
with a creature you control until one leaves play.
If it is unpaired, you may pair it with a creature
you control as it comes into play.
-As long as Sigurda's Bassilica is paired with
a Creature, the land gains "{t}:Add {w}."
-With a Blue one, it gains"{t}:Add {u}"
-With a Green one, it gains "{t}:Add {g}"
- The paired Creature gains +1/+1 and Flying.
It gains the White color and Angel type.