You need to get him as character. The shards are only to limit break him.
Ali
I was mistaken, after updating his master ability and correcting his ability: Armor of Break, + using the correct Vision card lvl99. He become one of the strongest units I have(ATK1500) .He Can 🔥 3 units in one hit at once!! And can take 2 to 3 strong hits !!! Amazing units if you know how to use him !!
Run Orlandeau's TMR on him, turn off his shield ability (with the cast time). Turn 1 he'll cast self haste, turn 2 he'll cast the landu TMR shield (instant cast). Now he gets double turns and he'll still take a beating before your other units catch up to him, but he'll usually drop kotetsus and excalibur, debuffing the opponents team and your other 2 dps can come clean up.
i really wish they put more gilgamesh shards in the shop...i'm saving visiores so i'm ready in case i find any, but those only appear on monday. so sad