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This is a Five Color (the format) essential

Its not much, but its a start

The Ozolith The Ozolith is one of the most well-known counter cards in Commander, and runs between $30-40 a copy at the time of writing

9 Swarmyard The overwhelming majority of Spider decks are two colors, which leaves room in the manabase for a few colorless utility lands

Jin-Gitaxias, Progress Tyrant Our highest-scoring Blue card, creature, and second highest scoring legendary card is this dork

Most Commander decks are going to want the vast majority of the remaining cards to be creatures, but if youre playing a deck that only cares about a different type of card, say instants or enchantments, then youll likely want to finish the deck off with those instead