https://i.gyazo.com/c43c12a3b4b38138...1f1ec6f460.png
https://i.gyazo.com/5e7ee7a858305fc3...7dc2c068bd.png
(open in new tab if they're too small to read)
Note, any skill, while having slightly different aesthetics, will do the same damage regardless of it's animation. For example, in the '60s Guaranteed Crit/DH GCD' section, we have Rose of Destruction, Triple Trident, and Matra Magic. While we might see 8 damage splats from Matra Magic, or 3 from Triple Trident, or just one from Rose, the damage values of adding those splats from Matra together would have equalled the splat of Rose, had Rose been the spell that was cast. Functionally, the damage behind the scenes is the same, it's just how that number is presented to the player that changes. Same goes for any other skill compared to it's counterparts in the category.
For gameplay, as I hastily outlined above, it'd be a fairly reactive and engaging gameplay style. You'd use your big damage stuff for your 2mins, pool stuff like the 40s OGCD charges so you can blast in 2min harder, but the gameplay loop of the 'filler' would be where the class keeps you on your toes. All of the singletarget, Circle, Cone, etc skills are equal potency. However, when you cast Martyn's Shortcoming-Seeking Scan (Libra), you get a buff for, let's say 5 spells. This buff grants a potency buff to one of those shapes, chosen at random. Thus, the gameplay is to react to that 'found weakness' and exploit it.
edit: spreadsheet has an error, Garuda and Ifrit would be 30s, one charge. Titan/Shiva/Ravana/Suzaku would be 40s, up to 3 charges