Caged Sun

Oracle Text

As Caged Sun enters the battlefield, choose a color.

Creatures you control of the chosen color get +1/+1.

Whenever a land's ability causes you to add one or more mana of the chosen color, add one additional mana of that color.

Card Rulings

6/1/2011 Caged Sun’s triggered ability is a mana ability, which means the ability doesn’t use the stack and can’t be responded to.