Edit: this deck won't work if pugs tap and generate random orb for you, and Sephiroth gets Barrier from reunion.
Atk stat needed seems to be around 5260 ish, otherwise you'll need to tap for more damage.
Deck is:
Squall Leonhart Skin - Sword Saint
Laevateinn
Orphan: FFXIII
Cerberus
A quiet Moment x2
I tried with 0 OB at first, then had to OB the job (it'll be useful for a few more hp for tanking on tower and i had to do it anyway later), then OB the cards, etc.
I failed a run with the 3 cards so I just Ob all 4 cards.
There are 205,421 views in 859 videos for Mobius Final Fantasy. Roughly 3 days worth of Mobius Final Fantasy videos were uploaded to his channel, or 89.74% of the total watchable video on Shiro's YouTube channel.