There are basic Energy cards (like Fire, Water, Grass, Lightning, Psychic, Fighting, Darkness, Metal, Colorless, Dragon, and Fairy, although Dragon and Fairy are now typically represented by other types or Colorless in modern sets) and special Energy cards, which often provide additional effects alongside energy
You can only activate 1 "Icy Breeze Refrain" per turn
This blue instant is more interesting in a storm shell, where you can cast it for free to up your storm count, but potentially get to recast a useful creature in the process
Some people will tell you the deck is way too powerful, and they are right in a sense, but at the same time, this means every other deck is always making it a priority to find a way of beating Regidrago