You can only really pull off this combo with Xyz Remora in hand. I would say the perfect hand for this deck would be a xyz remora, buzz saw shark, and chain summoning. Let me explain it in steps.
1: Summon bahamut
2: Summon nightmare shark with bahamut's effect
3: Overlay into full armor black ray lancer
4: Use xyz remora
5: then spam the heck out of more bahamuts and overlay into FO using the bahamuts after you summon toadally awesomes
You should have about 3 negates at normal but if you have chain summoning make that 4.
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