Like most Magic: The Gathering cards, the value of Ureni of the Unwritten 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 (Tarkir: Dragonstorm Commander)
Goldvein Pick is a strong starter, especially if you have some cheap evasive creatures to get in for damage
Shadowless cards are visually identical to first edition copies, except they do not have an "Edition 1" stamp
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At the beginning of your upkeep, if there are five colors among permanents you control, there are six or more card types among permanents you control and/or cards in your graveyard, and your life total is greater than or equal to your starting life total, you win the game
though this cant be used if your opponent has no Benched Pokemon, its still a pretty cool attack