Magics Mana system is a standout feature, and I argue one of the major appeals is the Color Pie that supports it
Anyway, Tashas Hideous Laughter is the newest card on this list, and its not quite as good in Commander as in other formats, but its still pretty absurd
Rare cards are hard to find, and owners are reluctant to sell
See Swarmyard
This means that, given the kind of mana you will need to cast him, there is every chance you could cast a cheap spell before combat on your next turn to trigger the additional four +1/+1 counters, then activate his mana ability to double that to eight and have him be a 13/13
1 The One Ring - 1/1 $2,000,000 A unique card in every sense, this one-of-one variant of The One Ring from Tales From Middle-Earth is in Post Malone's possession, who famously purchased it for $2,000,000 when it was discovered in a pack in Toronto