Like most Magic: The Gathering cards, the value of Aragorn, the Uniter depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (The Lord of the Rings: Tales of Middle-earth)
Vesuvan Doppelganger was more of a fun multiplayer card than anything else, but fond memories and thick wallets can create surprisingly high prices when mint-condition cards appear at auction
That is untrue
That last detail is especially important in the early game, before a clear threat has presented itself
When it enters the battlefield, it draws cards equal to the number of zombies you control or in your graveyard, whichever is bigger
The Omen would probably be a playable card in this set on it's own since it's a nice way to fix