Modern Horizons: Scale Up
Until end of turn, target creature you control becomes a green Wurm with base power and toughness 6/4.
Overload (You may cast this spell for its overload cost. If you do, change its text by replacing all instances of "target" with "each.")
This flexible spell brought Infect back to the forefront after the release of Modern Horizons. Scale Up one of your creatures, or all of them!