Equipment with an equip cost of zero is one of the easiest ways to maximize effects on Nadu, Winged Wisdom
Its a color pair with a pretty good amount of graveyard recursion, so discarding cards isnt always the worst that could happen
2 Battles Take Both Luck and Strategy Not Simply One or the Other When players are learning how to battle, oftentimes, one twist of bad luck could spiral the entire encounter
Some of it has to do with the power level of the cards in question and their relative rarity, but the most amusing contributor to their value is the simple fact that people love Charizard
Thraximundar became an ideal choice, not only because he would set different expectations against a fresh table, but he also is a solid back-up plan that can hit the board running with haste
Oh, and Special Conditions shut down Energy Burn completely, potentially rendering your DCE useless