Birgi, God of Storytelling // Harnfel, Horn of Bounty (Showcase) [Kaldheim] Astartes Berserker unless you pay {B}{B}{B}

unless you pay {B}{B}{B}

Or some wavy lines

squirrel elders tell tales of the fabled Nut Hoard of the Fallen Oaks

Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi

Birgi, God of Storytelling // Harnfel, Horn of Bounty (Showcase) [Kaldheim] Astartes Berserker unless you pay {B}{B}{B}Set: Kaldheim Type: Legendary Creature God Rarity: Rare Cost: {2}{R} Whenever you cast a spell, add {R}. Until end of turn, you don't lose this mana as steps and phases end. Creatures you control can boast twice during each of your turns rather than once. Reverse Type: Legendary Artifact God Legendary Artifact Discard a card: Exile the top two cards of your library. You may play those cards this turn.