As proven by Austere Command, the ability to be flexible in what needs to be killed greatly increases its power even if it is killing creatures the large majority of the time
Limit Break is also fantastic on its own
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
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
ACE SPEC Cards Crystal Wall R :1ED [BW6 059/059](Expansion Pack Freeze Bolt) Computer Search R :1ED [BW6 058/059](Expansion Pack Cold Flare) Gold Potion R :1ED [BW6 058/059](Expansion Pack Freeze Bolt) ACE SPEC cards were a new type of Trainer card which made their debut in Gen 5 dual set Freeze Bolt [BW6] and Cold Flare [BW6]