Mr. Shine and Mr. Bright

When this enters the battlefield it becomes Day.
If it is Day all white spells cost one less {w}.
If it is Night all black spells cost one less {b}.
{1} Time-shift (If it is Day, it becomes Night;
if it is Night, it becomes Day).
"We rule both the night and the day! This leaves
no time for you Kirby! Be gone!!"