Diamond Valley is sweet in Commander, a Bazaar of Baghdad reprint would make Vintage more affordable, Drop of Honey would help Legacy, and Id imagine that cubers would be happy with a cheap copy of Library of Alexandria
1 Melmetal The Strongest Steel-type Pokemon Melmetal is the toughest Steel-type Pokemon card
Bloodline Keeper / Lord of Lineage Bloodline Keeper is very strong with such a low cost for its activated abilities
I do like that Kambal cares about any kind of token your opponents' generate, whether that's food, creatures, or treasure
Milling five for two mana is roughly the same as a two-damage, two-mana Lava Spike, which is far below the curve
Magic has no shortage of ways it can be played, whether its sanctioned competitive formats like Modern or Legacy, Wizard-created formats like Archenemy, or the myriad fan-made possibilities like Horde or, well, Commander