Here are the cards that were next in line: Hillcomber Giant, Tower Drake, Pili-Pala, Sphere of the Suns, Thassa's Bounty, Balduvian Frostwaker, and yes, even that Golem's Heart
(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
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
almost every deck has it, but you should only use it if you face decks like this one, as you can easily defuse strategies quickly