Wand of Amphibious Form

{g/u}{g/u}: Target creature loses all of its
abilities and is a blue and green Frog
creature with base power and toughness
1/1. (It loses all other card types and
creature types.)
{g/u}{g/u}{g/u}{g/u}: Frogs you control get +3/+3 and
trample until end of turn.