Unstable Experiment is a common Instant card from Marvel's Spider-Man (SPM), collector number 47. Current market price: $0.23 (foil $0.27), TCGplayer market prices via Scryfall.
Target player draws a card, then up to one target creature you control connives. (Draw a card, then discard a card. If you discarded a nonland card, put a +1/+1 counter on that creature.)