Faithless Salvaging / Murktide Regent in Arclight Phoenix decks Arclight Phoenix was a very prevalent card in Modern not very long ago, and Faithless Salvaging gives the deck another reliable way to recur the bird(s) on turn three
On the other hand, Trinisphere thrives in a format full of free spells and, to make matters worse, can be cast as early as the first turn, taking the opponent out of the game for at least three turns
MTG Commander Masters is proved to be a divisive, but impressive set, at least when it comes to the quality of the reprints in it
Geological Appraiser Its easy to compare Geological Appraiser directly to Bloodbraid Elf, but repurposing cascade into discover and having this be an ETB instead of a cast trigger leads to way more combo potential, which earned the Appraiser an increased casting cost with its Arena rebalance
Fingers crossed you find one of these in your attic