Gates Ablaze deals X damage to each creature, where X is the number of Gates you control.
Illustrated by Eytan Zana · Pioneer Masters · #137
There are no rulings for Gates Ablaze.
Calamitous Cave-In deals X damage to each creature and each planeswalker, where X is the number of Caves you control plus the number of Cave cards in your graveyard.
Chain Reaction deals X damage to each creature, where X is the number of creatures on the battlefield.
Welding Sparks deals X damage to target creature, where X is 3 plus the number of artifacts you control.
Converge — Radiant Flames deals X damage to each creature, where X is the number of colors of mana spent to cast this spell.
Judgment Bolt deals 5 damage to target creature and X damage to that creature's controller, where X is the number of Equipment you control.
Spitting Earth deals damage to target creature equal to the number of Mountains you control.