Lets assume we as humankind can, not only wormhole the spacecraft, but planets and moons. So, what would've happened to Mars if we pulled icy Europa closer to the sun, we might use our flaming star to melt it down. If we at first, travel it through portal like structures next to Venus. We can heat it up, so it melts faster for calculated time and then send it back towards Mars. There we will pull Europa into orbit around our red brother and gradually siphon off some reasonable amount of water onto Mars' surface. So there'll be 30-50% of firm ground to use for colonization. What is needed after such task has been done for sufficient amount of oxygen to sustain life? Or before that?
PS: bare in mind, if Europa contains organic life, we might not use it, but Iapetus,Rhea,Enceladus,Tethys and/or Dione.