Beedrill ex While it doesn't do a ton of damage, Beedrill's attack is guaranteed to remove energy from your opponent's active Pokmon, which has the potential to be extremely frustrating in the right circumstances
It doesn't copy whether it's tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on
Youll often get a few 1/1 soldiers and a couple lands as this white creature sits in play, which is perfectly reasonable for a 4-mana play
Several other chase cards stand out for their curb appeal and beauty
Or if you really want to talk about unpredictable card advantage, look no further than the Cascade