Tasha's Hideous Laughter

Each opponent exiles cards from the top of their library until that player has exiled cards with total mana value 20 or more.

Errant, Street Artist

Flash
Defender, haste
{1}{U}, {T}: Copy target spell you control that wasn't cast. You may choose new targets for the copy.

{1}{U/R}{U/R}: Copy target instant or sorcery spell that targets you. You may choose new targets for the copy.

This spell can't be copied.
Copy any number of target instant and/or sorcery spells. You may choose new targets for the copies.

Copy target instant or sorcery spell, then return it to its owner's hand. You may choose new targets for the copy.