Presumably, the answer wont come until a later Lorcana expansion, but until then, there are plenty of clues scattered throughout the cards for collectors to piece things together themselves
If a permanent enters the battlefield under an opponent's control with hexproof or indestructible after Shadowspear's second ability resolves, it won't lose that ability unless you activate Shadowspear's second ability again
A creature token generator quickly brings you to a fully stationed Inspirit and a highly resilient board that doesn't need to go super wide to work smoothly
Battles are transforming, dual-faced cards that enter the field with a certain number of defence counters printed in the bottom left of the side with the Mana cost
Sure, sometimes youll need to concede a permanent or two, but sacrificing some of your creatures to target and destroy multiple others is still a trade usually worth taking
Each avatar also has its own unique voice lines that you have the pleasure of listening to