Goblin Haberdasher somehow makes it so that your creatures that are seen wearing a hat get Menace, a very useful ability that forces players to assign at least two creatures to defend against an attacking hat-wearer if they want to avoid damage
Siege Rhino C+ The standard behemoth that was Siege Rhino really gets taken down a few pegs in EDH
While we may not have gotten the Mega Charizard X ex SIR thats the most expensive Phantasmal Flames card, the Mega Venusaur ex Ultra Rare is a gorgeous card and one of the more valuable Mega Evolution cards, while Ns Reshiram IR is also a highly sought after card from Journey Together
Braids, Arisen Nightmare I love Braids, Arisen Nightmare, especially alongside cards like Mycosynth Wellspring and Carrot Cake that reward me for sacrificing them
A clean replacement is Rhystic Study if you want steady cards, or Esper Sentinel if you want a cheaper play that still taxes the table
Some proxies are simple slips of paper added to a sleeve with a regular Magic card, but you can also order card-like proxies from companies with printing facilitates that allow them to print on paper that resembles genuine playing cards