The defending team were: (blue) - Boldtusk - Vivica - Rigard - Zeline
and you attacked with Gravemaker against two cleanser nothing less…
Gravemaker - Magni - Delilah - Sartana - Zeline
Well, in my opinion you should have focused first on killing the three healers and then killing the blue attacker and Zeline: once you took out Vivica and Rigard you Gravemaker could have been more useful with his special not cleansed or you could have even swapped him with Boldtusk to reverse Zeline’s ATK debuff, empowering your strikers and blast your way to ghost tiling (center).
Its not like your team were so buff reliant so Zeline weren’t a primary target and in that case by bringing an ATK buffer, united to the fact that Zeline were on the wing and not near the tank, would have make her fire not so quickly (and not as effective).