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For example, you couldn't find a card with mana cost or one with mana cost

Arahbo, the First Fang Rarity: Rare TYPE: Legendary Creature SUBTYPE: Cat Avatar CMC: 3 Mana cost: USD: $0.47 EUR: 0.67 TIX: 0.02 EDHREC RANK: 4090 (2/2) Other Cats you control get +1/+1

Stoic Angel: A fun include from Shard of Alara block

They may occasionally pop up in competitive EDH decks, the most notable being whenever Rick, Steadfast Leader shows up once in a blue moon in a Legacy Humans decklist

Devouring Deep Rarity: Common TYPE: Creature SUBTYPE: Fish CMC: 3 Mana cost: USD: $0.34 EUR: 0.57 TIX: 0.00 EDHREC RANK: 27258 (1/2) Islandwalk (This creature can't be blocked as long as defending player controls an Island.) Disharmony Rarity: Uncommon TYPE: Instant SUBTYPE: - CMC: 3 Mana cost: USD: $48.82 EUR: 47.33 TIX: 0.00 EDHREC RANK: 27435 Cast this spell only during combat before blockers are declared