Just posting a bunch in this thread since I know some people really dislike Alchemy

High Fae Prankster - 2UB
Creature - Faerie Rogue
Flying, Deathtouch
When ~ enters the battlefield, choose up to one -

• Perpetually exchange target creature’s base power with another target creature’s base power
• ~ perpetually has base power/toughness 4/1
  1/4