Of course, there's some history and more to unpack there, so we'll leave the discussion for why Commander is called EDH for next time, for today, think of them as the same thing
Combo players love her because she pairs with synergy-heavy colorless cards like Staff of Domination and Umbral Mantle for infinite mana loops
Shes joined at the top end by Klauth, Unrivaled Ancient
There arent a lot of X-cost Instant and Sorceries available in this deck, but the first ability is much better than some of the weaker cards in the original list for this deck
Storm is considered to be Magics most broken mechanic in history by WotC
Improving your Scry effects makes the activated ability more consistent, but also just amplifies your ability to dig through your deck at no extra cost