Thrumming Stone [Coldsnap] 076 you don't lose this mana

you don't lose this mana as steps and phases end

Once each turn

Set: Judge Gift Cards 2020 Type: Enchantment Rarity: Rare Cost: {G}{W} Other enchantments you control have shroud

Set: The Lord of the Rings: Tales of Middle-Earth Prerelease Promos Type: Legendary Artifact — Equipment Rarity: Rare Cost: {3} Flash

When that mana is spent to cast an instant or sorcery spell

Thrumming Stone [Coldsnap] 076 you don't lose this manaSet: Coldsnap Type: Legendary Artifact Rarity: Rare Cost: {5} Spells you cast have ripple 4. (Whenever you cast a spell, you may reveal the top four cards of your library. You may cast spells with the same name as that spell from among the revealed cards without paying their mana costs. Put the rest on the bottom of your library.)