In conjunction with Kill Switch, that means you can keep all other creatures tapped permanently, freeing you up to attack with impunity (provided nothing with haste comes at you)
For these reasons, it is only legal in Vintage, where it is restricted to one copy per deck, Canadian Highlander, where it is high on the points list, and Cube, where it is often drafted as early as possible
There are great elves and faeries that like to come down in droves so it's not too hard to keep a few relevant creatures on board
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.) Gatling Blaster Whenever this Vehicle attacks, it deals 5 damage to each opponent
but when the Wizard decks I would build were not able to keep up with other decks around me, I felt disenfranchised