Myriad Skyship

Flying, 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.)
When Myriad Skyship attacks, for each creature crewing it, create a token thats a copy of Myriad Skyship thats tapped and attacking.
"Into the cloud, 17 warriors sailed on one rickety boat through the skies. What emerged from the cloud was an army of 17, shiny skyships."