Erica, The Vessel

Colorless, Vessel (This creature gets a +1/+1 counter
every time it changes color)
Whenever Erica, The Vessel enters the battlefield, choose a color. Erica, The Vessel becomes that
color until your next turn.
Erica, The Vessel is immune to it's current color.
"The Vessel allows The Slayer to descend upon
the Earth..."-The Prophets