Caged Sun

As Caged Sun enters the battlefield, choose a color.
Creatures you control of the chosen color get +1/+1.
Whenever a land's ability adds one or more mana of the chosen color to your mana pool, add one additional mana of that color to your mana pool.
The magical potential from trapping a star's light is undoubtedly great but the potential from trapping a collapsing star in its entirety is unimaginably greater.