Also, draw a card and maybe bounce a thing
March of the World Ooze (Showcase Fracture Foil) This is a pretty neat, if a bit high-cost, anti-control card that can turn your little mana dorks or tokens into beefy 6/6 creatures
Overrun is not quite as flexible as the Cloud and requires you to have a decent dork count and so I rate it less highly but it is a similar style of card that in the power levels of cube you need to employ to be able to get you there against a lot of decks
Like most Magic: The Gathering cards, the value of Phyrexian Arena 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 (Foundations)
Send in the Clowns In the worst case scenario where we can't make a determination from images you supply, we can always fall back on having you send suspect cards to us for verification