Mtgarena, the Limitless

Trample, indestructible
Each mana symbol in this card's mana cost only
counts towards your devotion if you paid mana
for it.
As long as your devotion to white, blue, black,
red, and green is less than fifteen, Mtgarena isn't
an artifact and loses crew 5 and trample.
Crew 5 (Tap any number of creatures you control
with total power 5 or more: This Vehicle becomes an artifact creature until end of turn.)