Scale Up is a uncommon Sorcery card from Modern Horizons 1 Timeshifts (H1R), collector number 23. Current market price: — (foil $1.44), TCGplayer market prices via Scryfall.
Until end of turn, target creature you control becomes a green Wurm with base power and toughness 6/4. Overload {4}{G}{G} (You may cast this spell for its overload cost. If you do, change "target" in its text to "each.")