So that I don't have to write another article just to cover it, we should note now that the final Court option for this deck, Court of Embereth is also spiking, but is currently at a lower price point than its blue and black brethren
Lurrus specifically and companions in general almost immediately broke the game, dominating quite literally every format in existence until Wizards was forced to take the unprecedented step of errata'ing the entire mechanic by essentially adding a three-mana tax to companions
For our purposes, the spear can be thrown (javelins are okay), as long the weapon's general shape clearly implies spear
If you control a battle and an opponent is its protector, you still control the battle, and mana symbols in its mana cost count toward your devotion
UPDATE (August 2, 2023): The card was sold to Post Malone for $2 million