Yes, Rogue can PROBABLY take down Bastion with a Savage Beatdown, but what happens when you don't have that Beatdown?;)

team attack.

And whatever happened to the guy that is standing in front of Bastion?

What cyke means is team attack with Rogue and Polaris/Archangel. Everybody has flight, so Nimrod in front isn't terribly relevent.

There are two common, but distinct approaches to creating a curve X-men deck. The first, advocated by cyke and Lieter, uses Polaris, Archangel, and Rogue at drops 4 thru 6. This build focuses primarily on KO effects and board control.

The second build, suggested by DarkestMage, cthulhu, and billking uses Rogue, Howlett, and Colossus at drops 4 thru 6. This build focuses on using Combat Reflexes (and to a lesser extent, Burn Rubber) to abuse Howlett's effect.

IIRC, both builds rely heavily on getting an early Cerebro, make use of Total Anarchy, Gambit and Sunfire as swarm control, and use Prof X/Demon as game finishers.