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One of the quirks of the Commander rules is that if a mana symbol appears in the casting cost or in the text box of a card, the color of that mana symbol contributes to the card's "color identity." So if you used Ishkanah, Grafwidow as your commander, you could include green or black cards in your deck

The new Omnath, Locus of the Roil may like this as well

Flashback, dredge, buyback, and other abilities that let players reuse cards are ignored

If you don't play the card, that's fine, it just stays in exile, junking up the place for the rest of the game

For creatures, that usually means you must cast it during a main phase of your turn while the stack is empty