Violent Outburst is a common Instant card from Foundations Jumpstart (J25), collector number 746. Current market price: $1.23, TCGplayer market prices via Scryfall.
Cascade (When you cast this spell, exile cards from the top of your library until you exile a nonland card that costs less. You may cast it without paying its mana cost. Put the exiled cards on the bottom in a random order.) Creatures you control get +1/+0 until end of turn.