The Painting Tree

{t}, add {r} if {x} was {2}. Add {c} if {x} was {1}, add {r}{w} if {x} was {3}, add {r}{w}{u} if {x} was {4}, add {r}{w}{u}{g} if {x} was {5}, or add {r}{w}{u}{g}{b} if {x} was {6} or more.
This artifact creature only untap if you control two or more basic lands.