Iron Bear, Vladof Mech

Trample
Whenever Iron Bear, Vladof Mech becomes
crewed for the first time each turn, creatures
crewing it get +0/+1 until end of turn. For each
of those creatures, you may pay {r}. When you
do, untap that creature.
Crew 4 (Tap any number of creatures you control
with total power 4 or more: This Vehicle becomes an
artifact creature until end of turn.)