Commander Masters [A Must-Have Set for Commander Fans] As someone who spends most of their game nights at the Commander table, Commander Masters caught my eye immediately
Black 2, White 2 : I'm not entirely sure why it took so long for these games to get the recognition they deserve - they take games that pretty much only have one major flaw (pokmon pool, as if that's not a recurring theme) and address it
You may cast Dark Salvation with X as 0 just to have a creature get -1/-1 for each Zombie a player controls, and you may cast it without targeting any creature just to have a player get Zombie tokens
Japanese Size (Yu-Gi- Oh!)
Manifesting huge creatures, sacrificing them for value, and then reanimating them later sounds like a diabolical plan
One final thought: Some of the most surprisingly valuable items are the ones youd never think to check