Chain of Plasma is a uncommon Instant card from Onslaught (ONS), collector number 193. Current market price: $0.23 (foil $6.29), TCGplayer market prices via Scryfall.
Chain of Plasma deals 3 damage to any target. Then that player or that permanent's controller may discard a card. If the player does, they may copy this spell and may choose a new target for that copy.