2 cards where the name includes “pandemonium”

Pandemonium (Tempest Remastered #149)

Pandemonium {3}{R}

Enchantment

Whenever a creature enters the battlefield, that creature’s controller may have it deal damage equal to its power to any target of their choice.

“If we cannot live proudly, we die so!”
—Eladamri, Lord of Leaves

Illustrated by Pete Venters

Standard
Alchemy
Pioneer
Explorer
Modern
Historic
Legacy
Brawl
Vintage
Timeless
Commander
Pauper
Oathbreaker
Penny
Pyxis of Pandemonium (Theros #220)

Pyxis of Pandemonium {1}

Artifact

{T}: Each player exiles the top card of their library face down.

{7}, {T}, Sacrifice Pyxis of Pandemonium: Each player turns face up all cards they own exiled with Pyxis of Pandemonium, then puts all permanent cards among them onto the battlefield.

Illustrated by David Palumbo

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

The arc of my blade has carved a path of light to the end of these results.