Tember City is a common Plane — Kinshala card from Planechase Anthology Planes (OPCA), collector number 79. Current market price: $6.34, TCGplayer market prices via Scryfall.
Whenever a player taps a land for mana, Tember City deals 1 damage to that player. Whenever chaos ensues, each other player sacrifices a nonland permanent of their choice.