Saheeli, the Gifted is a fine commander, with her ability to add a bunch of mana with her second +1 being especially scary, but she suffers from the fact that there are a bunch of artifact-based Commanders available, including the extremely powerful Breya, Etherium Shaper, so being "fine" might not be enough to pick Saheeli, the Gifted as your Commander over other options
Instant is no big deal and so it is just a high risk 3 drop single ramp spell
Thats it for now, but Ill be back soon with a full overview of the new and returning mechanics of the set, as well as more technical information about how battles work
By generating two additional creature tokens per turn, you can make them stronger with cards like Divine Visitation or double them with cards like Anointed Procession
Liberty Prime, RechargedLiberty Prime, Recharged only takes up two energy a turn, and you can immediately net that back even as you pay it due to its vigilance and it's sacrifice ability