Thrumming Stone [Coldsnap] Amonkhet Invocations it becomes an Aura with

it becomes an Aura with "enchant creature put onto the battlefield with Necromancy

create a 3/3 colorless Wurm artifact creature token with deathtouch and a 3/3 colorless Wurm artifact creature token with lifelink

Set: Alliances Type: Artifact Creature — Wall Rarity: Uncommon Cost: {0} Defender

The cave floods with light

"First through the Riftstone was Genesis—and the world was lifeless no more

Thrumming Stone [Coldsnap] Amonkhet Invocations it becomes an Aura withSet: Coldsnap Type: Legendary Artifact 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 any revealed cards with the same name as the spell without paying their mana costs. Put the rest on the bottom of your library.)