Regardless of its cost, The Balrog, Durin's Bane adds serious power to the board, as a 7/5 that can only be blocked by legendary creatures
(Look at the top X cards of your library, then put any number of them into your graveyard and the rest on top of your library in any order.) Once Lydia Frye has been blocked, increasing the blocking creature's power to 3 or greater won't cause Lydia Frye to become unblocked
Lacking a traditional 36-pack booster box entirely, its Elite Trainer Box configuration has naturally captured the primary capital allocation for this set, outperforming standard block alternatives like *Mega EvolutionChaos Rising* thanks to highly coveted Special Illustration "God Packs." 3
A pretty mid card (or even a bad one, by all standards) was the only available answer at that time
In general, Blue struggles to remove anything permanently, but it does have a few pieces of removal up its sleeve