Chandra's Incinerator - Showcase (M21) from Core Set 2021, available at 401 Games Canada.

• Rarity: Rare
• Finish: Normal
• Artist: Craig J Spearing
• Card Text:
  This spell costs X less to cast, where X is the total amount of noncombat damage dealt to your opponents this turn.
  Trample
  Whenever a source you control deals noncombat damage to an opponent, Chandra's Incinerator deals that much damage to target creature or planeswalker that player controls.