Okay, so I finally finished Minwu event's bonus battles. Emperor is sorta annoying, I had to retreat and pack Slowga on Y'shtola and Dispel on Yuna to make him reasonable. The Gigases... man, was that ugly. My setup:
L80 Donkey Kong Cecil - Pound, Magic Break, Mako Might RM
L65 Zidane - Blind Shell, Lifesiphon, Dragoon's Determination RM
L65 Eiko - Curaja, Shellga, Dr. Mog's Teachings RM
L80 Rinoa - Blizzaja, Meteor, Knight's Charge RM
L65 Edge - Dismissal, Tempo Flurry, Ace Striker RM
Sentinel's Grimoire RW
My idea was to use Cecil's Boostga to improve offense and Edge's AoE cancel to keep the Gigases somewhat under control. The biggest problem is that you WILL end up bereft of Sentinel's Grimoire charges by the end and their offense is way too scary to run sans SG even at their high HP phase. I went for the Thunder Gigas first, since I figured chipping the other two with Meteor until it died would be sufficient... and I was right to a degree. Thunder Gigas, being immune to Slow, is the most dangerous to leave for last if you're running the final stretch sans Wall. By the end, I had only Cecil and Rinoa alive (Fire Gigas downed Zidane with a Shift Break charge ready to go just before dying and Ice Gigas just OHKOed Edge at some point. Eiko's death was all but inevitable at that point, but I could finish him off), but I still mastered because I still had full medals for actions. I'll just take it and never think of this fight again. Weirdly, I'm not sure how would I successfully pull this fight off without the extra tools granted by the Lucky Draws. Cecil's Boostga was paramount for keeping my offense viable and Edge's cancels were all really timely until he died (he got three of them off). Go figure.
And yeah, a 104 Attack dagger for a common, dangerous realm given for free is shockingly good. Even the SB is kinda nice in a way, since Slow's a nice status to have, but difficult to slot. That's a real surprise coming from DeNa.