Choose whichever legend you like out of the box
Thousand-Year Storm Rarity: Rare TYPE: Enchantment SUBTYPE: - CMC: 6 Mana cost: USD: $0.98 EUR: 0.51 TIX: 0.02 EDHREC RANK: 1399 Whenever you cast an instant or sorcery spell, copy it for each other instant and sorcery spell you've cast before it this turn
Instant and Sorcery cards represent magical spells a player may cast for a one-time effect, while Creature, Artifact, Enchantment, Planeswalker, and Battle cards remain on the Battlefield to provide long-term advantage
Good enough, sure, but playing a partner just for extra colors isnt that common in casual Commander
And you can very much use them in Limited formats, if you open them in your Sealed pool or pick them for your drafted deck