On topic I would say tie between Dregn and Shaak, although Beast is beast against 8 powers which see a lot of play this week. By same token a lot of commonly played cards dominate c-beast. Oflgn is too situational for me personally without any form of manip.
Shaakarti is a solid 7/7, with a courage sob. She can basically counter any sob clan with her sob, which is very very good. She's also solid vs soa and vs manip clans like Montana and all stars (she's a realeative +12 atk and +2 power respectively). However, her fatal flaw is her non-synergy with C Wing, which basically sucks
Dregn is a potential 8/8, and has 5 unblockable damage. Not really too remarkable, as someone like Spiaghi can reduce fully still. His main weakness though is soa, as it'll halve his damage and make him unusable.
C Beast is a potential 9/8, and has a bonus too unlike that old dude. His damage is solid, and his power... is a very scary 5. Soa and you have a waste of 5*
Oflgn is 7/5/5, which is fine. The problem is 1. Vortex Dr is Nonexistent 2. Cyb Lhia takes up less space and has more power 3. Soa makes this card unusable
Overall, Shaakarti is the best, Dregn for solid power, C Beast for solid damage, Oflgn for solid... well it's the thought that counts