Any effects that interact with counters a player gets, has, or loses can interact with energy counters
The classic example is the Revised Edition Serendib Efreet, which was printed with the art and green border of a different card, Ifh-Biff Efreet
Unfortunately, the second Through the Ages bonus sheet card to be revealed isnt quite as amazing for everyone
Cards like Rosie Cotton of South Lane, Ivy Lane Denizen, and Sadistic Glee create a variety of infinite loops
All that, and weve not even touched on the dice rolling synergy and myriad tribal cards in the set like Hobgoblin Bandit Lord, Plundering Barbarian and Acererak (better with Rooftop Storm!)
The games almost always feature base spells that deal elemental damage, and those have upgraded versions