2 cards where the name includes “worldfire”

Underworld Fires (Theros Beyond Death #162)

Underworld Fires {1}{R}

Sorcery

Underworld Fires deals 1 damage to each creature and each planeswalker. If a permanent dealt damage this way would die this turn, exile it instead.

The Underworld is anything but a resting place.

Illustrated by Bayard Wu

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Worldfire (Magic 2013 #158)

Worldfire {6}{R}{R}{R}

Sorcery

Exile all permanents. Exile all cards from all hands and graveyards. Each player’s life total becomes 1.

Even the smallest spark may set a world ablaze.

Illustrated by Izzy

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny

Their mind whirled with grand plans, never thinking of what might happen if they got to the end of the list.