Dumbo, Ninth Wonder of the Universe Enchanted, 228/204 Easily the most valuable Enchanted card in Fabled , even Dumbos standard, non-Enchanted variant has caused quite a stir, and is very valuable itself
Miriam: Scarlet & Violet (Special Illustration Rare, 251) New Era, New Expensive Cards The Scarlet & Violet era introduced a bunch of now staple mechanics and rarities to the TCG, which saw the continued rise of popularity for the game as well as card prices
The reasons why are pretty simple: everyone loves Gengar, and this is the first alternate-art Gengar card ever printed (if you dont count Phantom Forces)

Scoria Wurm - Not that exciting, but its a cheap threat that you could hopefully keep alive longer with Krark's Thumb Mirror March - This can get out of hand really quickly, and there's basically no downside to losing flips Yusri, Fortune's Flame - Designed to be a commander, but it's a solid card to include in the 99 as well Goblin Traprunner - Tons of easy flips with no downsides Squee's Revenge - Can be a huge card draw Planar Chaos - This one can be a bit annoying and might only be good if you also have Krark's Thumb, but it lets you play more controlling Krark, the Thumbless - Similar to Planar Chaos, use at your own risk Frenetic Efreet and Frenetic Sliver - A single card that lets you flip as many coins as you want (you can activate the ability as many times as you want before you let any of the activations resolve, and then even if he dies you still flip all the coins) Puppet's Verdict - A sweeper that let's you control what to kill if you can manipulate the flip As for other cards that I think could fit the strategy of the deck, I would focus on ways to multiply your other effects (extra upkeep steps, copying your permanents, doubling your abilities, etc)

The only way to make this card offer something that other Rank 5s don't is to use a ton of monsters, but that's incredibly wasteful considering you could just deal the same amount of damage, if not more, with Volca (and Volca only costs 2 Level 5s, which isn't a ton of monsters)
Each 100-card ready-to-playMagic: The GatheringUniverses Beyond: Doctor WhoCommander Deck makes it easy for Commander fans to grab a deck and play right away