Each trainer must try their best to reach a Pokemon Center at the end of an obstacle course, including limbo, hurdles, and targets to hit with a squirt gun
While this doesn't get all the threats as Fierce Empath basically does this gets all the best ones and it does so for a mana less
With that said, for me this list begins with Aethersquall AncientAethersquall Ancient, which while expensive, is the threat that I have seen win energy decks the game time and time again
For example, I can have four copies of [mtg_card]Lightning Bolt[/mtg_card] in my Vintage deck, but only one copy of [mtg_card]Black Lotus[/mtg_card], because its on the restricted list
The triggered ability helps ensure you always have a creature to play and such an effect is the lifeblood of many green decks
My names Michael Celani, who you might know as the guy that made that Licids deck, and Ill be your whiter writer for the day