While the Extra Deck was only comprised of Fusion and Synchro Monsters at the time of the card's original Western release (it was released in 2001 in Japan, when only Fusion Monsters existed in what was then the Fusion Deck), in modern play the card could bring out a whole host of Xyz, Pendulum and Link Monsters with ease -- were it not for the card's errata
Here are all of the Background Enchantments by color: White The White Enchantments mostly help with combat
Poliwrath features one of the widest ranges among its most valuable cards, starting with cards under $20 and eventually working their way up into the hundreds of dollars for the best Poliwrath card you can buy
Durable Body can, on a coin flip, prevent KO and save it with 10 HP instead
The default commander, The Swarmlord, complements this idea by not only getting 2 +1/+1 counters for each time its cast from the command zone, but also draws a card any time a creature you control with a counter on it dies
You can only use this effect of "Evil HERO Adusted Gold" once per turn