Can someone explain to me the logistics of a cosmic multiattack? I don't get it at all.

He basically gets three "regular" actions per turn.

So G can take a move action to base the cleverly Stealthed Martian Manhunter, a cc action to stomp him with Exploit Weakness, and then take a rc action to target three figs with Energy Explosion.

Dear God!!!!

I have never seen him used before, thankfully, and I dread the time when I will. Knowing my luck, it will be @ the next tourney I'm going to.

Wow! Combined with cosmic power (correct me if I'm wrong), he can do that every turn?!

Yes like any big fig he can act every turn, continuing to push even after 2 turns. But with Power Cosmic TA he doesn't take any push damage for doing so.

Tarnish

But really, he's not borken for his points...

Actually, I love Galactus, but he has no business showing up in a competitive tournament as part of someone's force.

Wait wait wait.... Can a smaller big fig (a.e. Sinestro/Sentinel) Move and then attack, using their Regular Multi Attack? Can Sentinel do two consecutive Running Shots? Hmmb.

Oh, also, he wouldn't have to base Martian Manhunter.

Galactus ignores Stealth, and all TAs that emulate it. Heh heh heh.

The Sentinel and Sinestro cannot use Move Actions as part of thier multi-attack, but they can use Power Actions. So, they cannot move, then attack, but the Sentinel can use 2 RS Actions.

Only the Scenario G ignores Stealth. The Force G does not. Only the Force G can use the Cosmic Multi-attack, so the above example is a perfectly good example of a Cosmic Multi-attack.

When acting as a force for a standard game, Galactus doesn't get to ignore Stealth or it's TA counterparts. Only the Scenario version of Galactus ignores them.