The World Crystal

Whenever a nonartifact permanent you control
or an instant or sorcery you cast enters the graveyard, exile it. If that card was white, create a
1/1 white spirit creature token with flying. If
blue, draw a card. If black, create a 2/1 black
lesser demon creature token with menace. If red, create a 3/1 red elemental creature token. If
green, add {c}{c} to your mana pool.
The World Crystal is all colors and can be your commander.