Mystic Forge [Core Set 2020 Prerelease Promos] Magic Player Rewards 2004 If damage from a creature

If damage from a creature source is prevented this way

Set: Betrayers of Kamigawa Type: Enchantment — Aura Rarity: Common Cost: {2}{B} Flash

Set: Beta Edition Type: Sorcery Rarity: Rare Cost: {X}{U}{U}{U} Destroy X target Mountains

so many new channels are carved for them

Mystic Forge [Core Set 2020 Prerelease Promos] Magic Player Rewards 2004 If damage from a creatureSet: Core Set 2020 Prerelease Promos Type: Artifact Rarity: Rare Cost: {4} You may look at the top card of your library any time. You may cast artifact spells and colorless spells from the top of your library. {T}, Pay 1 life: Exile the top card of your library.