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
Equipment with an equip cost of zero is one of the easiest ways to maximize effects on Nadu, Winged Wisdom
If there are additional costs to cast a spell, or if the cost to cast a spell is increased by an effect (such as the one created by Thalia, Guardian of Thraben's ability), apply those increases before applying cost reductions
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
Id expect to see more of this in the future
Oh, and Special Conditions shut down Energy Burn completely, potentially rendering your DCE useless