Radstorm is a rare Instant card from Fallout (PIP), collector number 37. Current market price: $4.91 (foil $6.23), TCGplayer market prices via Scryfall.
Storm (When you cast this spell, copy it for each spell cast before it this turn.) Proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)