Power cards come in several varieties: Energy, Fighting, Strength, Intellect, Multi-Power, & Any-Power
Power cards are vital in each deck, and can be used as an attack or for defense.
There are several versions of each power card for; energy, fighting, strength, intellect, and multi-power.
Any-Power cards were limited to only 1 version of each of the following levels: 5, 6, 7, 8 (see pic below)
Multi-Power power cards included a 3-stat (energy, fighting, strength) and a later revised 4-stat (including intellect)
Below are some pics representing various power cards.
ENERGY POWER CARDS
FIGHTING POWER CARDS
STRENGTH POWER CARDS
INTELLECT POWER CARDS
MULTI-POWER POWER CARDS
ANY-POWER POWER CARDS