The trick is to poison an opponent early on with Toxic, then follow up with Sleep, Bind , Stun or Accuracy-lowering techniques that don't cause much damage but prevent your opponent from switching or hitting you
Erika's Invitation 203/165 Special Illustration Rare Holofoil One of the only Support cards to be included in this list, Erika's Invitation , is a Special Illustration Rare full art card in the Pokmon 151 set
Chandra's Ignition, Terror of the Peaks, and Warstorm Surge can end the game on the spot, and if those don't, Return of the Wildspeaker should give you enough cards to more than refill your hand
This is because it is a purposive card, you can put it in a deck and improve that deck with no prior knowledge of your opponents deck or who is on the play
His alter ego, Professor Ooyama, can be seen in the bottom-right corner of the card