(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
None of the expensive cards are irreplaceable and theyre hard to get, but some (like Anointed Procession) are highly desirable

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Dinosaurs are generally in Naya (red/white/green) colors, and tend to play a lot of creatures that cost a hefty bit of mana