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Rather than adding expensive cards just to increase the price and have a "non-budget build" of the deck, I'd just keep playing it as is and adjust the sideboard as necessary based on how the Zendikar Rising format develops

If you are in a Patient Rebuilding deck, you end up playing it for sure though, so this is a very specific build around

Like scry, surveil is a predominantly blue mechanic

You can toss a +1/+1 counter on this for each dork that left the battlefield this turn under your control, so that's great EOT to make a beater after a foe casts a mass removal spell on their turn or yours

The most common answer is so you can stampede all over your opponents monsters and free up the field for a follow-up attack next turn