Echo of Eons [Modern Horizons] Dark Ascension Promos I don't think you build

I don't think you build one on purpose

Goblins Type: Creature — Elf Druid Uncommon Cost: {2}{G} When Elvish Harbinger enters the battlefield

Set: Rise of the Eldrazi Type: Creature — Demon Mythic Cost: {3}{B}{B}{B} Flying Whenever Hellcarver Demon deals combat damage to a player

{T}: Exile the top card of your library face down

Set: Lorwyn Type: Artifact Rare Cost: {2} Prevent all combat damage that would be dealt to attacking creatures you control

Echo of Eons [Modern Horizons] Dark Ascension Promos I don't think you buildSet: Modern Horizons Type: Sorcery Rarity: Mythic Cost: {4}{U}{U} Each player shuffles their hand and graveyard into their library, then draws seven cards. Flashback {2}{U} (You may cast this card from your graveyard for its flashback cost. Then exile it.) The present is a matter of perspective.