Gemstone Caverns [Time Spiral] Pauper Roar of the World is

Roar of the World is in the command zone or on the battlefield

any player may pay half their life

Set: Eternal Masters Type: Artifact Rarity: Uncommon Cost: {3} Sacrifice a creature: Add {C}{C}

ante the top card of your library

Set: Classic Sixth Edition Type: Artifact Rarity: Uncommon Cost: {3} Sacrifice a creature: Add {C}{C}

Gemstone Caverns [Time Spiral] Pauper Roar of the World isSet: Time Spiral Type: Legendary Land Rarity: Rare If Gemstone Caverns is in your opening hand and you're not the starting player, you may begin the game with Gemstone Caverns on the battlefield with a luck counter on it. If you do, exile a card from your hand. {T}: Add {C}. If Gemstone Caverns has a luck counter on it, instead add one mana of any color.