Alone, they'll quickly be chewed up by enemy forces, but if you can lay out a nice smattering of characters you can quickly overwhelm your opponent
See rule 702.51, Convoke. 702.51a: Convoke is a static ability that functions while the spell with convoke is on the stack
It shuts down other effects as well - your opponents can't cast spells from anywhere other than their hands, so no casting spells using Madness, Plot, Mayhem, or a whole bunch of red impulse draw effects
If you buy something from a Polygon link, Valnet Inc
Each box comes with three play bplayoosters and a set of exclusive foil scene cards, along with art-only display versions
The only hurdle to jump is to make sure you have a good balance of humans and non-humans, but as most of Final Fantasy s creatures are humans, that shouldnt be too difficult to accomplish