The only way to get all the way down to 99 cards is by narrowing your focus on what exactly you want your deck to do
Personally, Im so low on Lightning Strike that I wonder if Heartflame Slash could have just been cost at 1R, but even at 2R this is a card that Mono-White Aggro decks will just play and often splash some red sources for, as well as a respectable option for fully Boros decks
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While she's rivaled in popularity by some, such as Lance and Leon, Cynthia is loved by many
25-21) Doubling Season ($25), Woodfall Primus ($10), Mana Reflection ($10), Genesis ($15), Regal Force ($8) Im lumping these cards together because they often end up in the same kinds of Commander decks: big, green, angry brews that overwhelm opponents with mana ramp, tokens, fat, and utility