The price is enough that you can get decently effective and powerful cards but the cost is also low enough that you can also get a lot of tempo out of using them
For Aura Pump I would advise picking up: Silent Hallcreeper: this 2 drop provides you with a great early creature that can't be blocked until you have to transform it into a copy of one of your other craetures
This only works with Swamps, but if you have a card like Urborg, Tomb of Yawgmoth, which turns all your lands (and your opponents lands) into Swamps, you have a ton of mana at your fingertips
Currently, it is listed on TCGPlayer for $145.00 , though I'm not sure about the exchange rate for puppies
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You just can't afford to put enough equipment into your deck to get paid off for your equipment synergy cards, because you don't have enough creatures and end up with three equipment in play and nothing to put them on