Radiate is a rare Instant card from Secret Lair Drop (SLD), collector number 2536. Current market price: $4.22 (foil $4.36), TCGplayer market prices via Scryfall.
Choose target instant or sorcery spell that targets only a single permanent or player. Copy that spell for each other permanent or player the spell could target. Each copy targets a different one of those permanents and players.