Data Houz, Mobile Rampart

On your upkeep, Data Houz, Mobile Rampart gains vigilance and trample until end of turn.
Crew 6( Tap any number of creatures you control with total power 6 or more: This Vehicle becomes an artifact creature until end of turn.)
When Data Houz, Mobile Rampart attacks, you may pay {6}. If you do, each creature you control cannot be blocked and gets +1/+1 for each creature on the battlefiel