Time Walk has such a simple effect, yet its so cheap and powerful that it would give its user an overwhelming advantage, especially if they were able to use multiple versions in their deck
Regional Bonus: The western versions of War of the Lions have dubbed cutscenes, whereas the original was text only
I put Gifts Ungiven, Painters Servant, Panoptic Mirror, Protean Hulk, Recurring Nightmare, and Trade Secrets in this particular category
Obviously, Legacy & Vintage have access to every land ever printed, including the original dual lands
While it can still deal damage the same way its purely Goblin counterpart can, it can also ramp out even bigger Eldrazi thanks to the tokens it produces, 0/1 Eldrazi Spawn that can be sacrificed to produce a colorless mana