1st edition pokemon base set booster pack released in 1999 Base Set (Pokémon) - Wikipedia

Even with the bigger deck sizes of Commander, you should only need about 20 legends in your deck to hit something reliably

Honorary Mention: Rainbow Rare Introduced with Sun & Moon and ending with Sword & Shield , Rainbow Rare is a discontinued rarity that featured identical artwork to another full-art card in their respective sets but recolored with a rainbow gradient on the character artwork and background

It has some prowess cards you can use to bolster synergies

Roar of Resistance makes your tokens more aggressive, but it has excellent utility as you can buff your opponents creatures with the activated ability to allow for maximum pressure on the player whos ahead