I think thisll be powerful, but it primarily tops the list because this is what I want out of a commander
Firstly, she taps for mana, and when that mana is spent on a creature, it enters with two +1/+1 counters on it - representing her literally summoning a powerful monster to the battlefield
Her attack trigger allows her to exile the top four cards of her library and cast any noncreature spells among them for free, often leading to devastating chains of extra turn or extra combat spells
8 Thalia, Heretic Cathar Slow your opponents down
This card sits at the intersection of blink, lifegain, and energy, helping cards like Ocelot Pride, Phelia, Exuberant Shepherd, and good energy cards
Don't fall into the trap of calling counterfeit cards proxies because it helps normalize their use in the community and reinforces their acceptability, which is a bad thing for the game, its players, local game stores, and Wizards