Arena of the Ancients [Legends] Bird Advisor The cube's surface is pockmarked

The cube's surface is pockmarked with jagged runes that seem to shift when unobserved

Set: Core Set 2020 Type: Legendary Creature — Demon Rarity: Rare Cost: {5}{B}{B}{B} Flying

If you can

After lightning struck the cliffs

000 Type: Enchantment Rarity: Uncommon Cost: {1}{U}{R} Whenever a land enters the battlefield under your control from anywhere other than your hand or you cast a spell from anywhere other than your hand

Arena of the Ancients [Legends] Bird Advisor The cube's surface is pockmarkedSet: Legends Type: Artifact Rarity: Rare Cost: {3} Legendary creatures don't untap during their controllers' untap steps. When Arena of the Ancients enters the battlefield, tap all legendary creatures.