For three ink you can play this action card, drawing two cards from your deck
Battles can be dealt damage and attacked, like planeswalkers, and damage to them causes that many defense counters to be removed
Thundermane Dragon also seems like a generally good card that you could run in any Magic: The Gathering deck focused on large creatures
Legendary status has no build restrictions in singleton formats as they do in constructed
Koma is so good that it will probably push players to run sacrifice-based removal like Extract a Confession or Deadly Brew
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