Kaleidos, the Iridescent

Flying
When Kaleidos is not on the battlefield, it is all
colors.
At the beginning of your upkeep, you may
choose a color other than Kaleidos' current
color. Kaleidos becomes the chosen color.
Spells that share a color with Kaleidos cost one
less of that colored mana to cast. (For example:
if Kaleidos is white, a spell that costs {2}{w} now only
costs {2} to cast.)