You could put a couple lingering souls in that would give you some flyiers and it is only 1.99 each. Gather the Townsfolk is another one, it is .49.
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Trostani is good but she is expensive for budget at $9.99. If you are going to be able to put out some tokens you might try to get a parallel lives for around $3 or a Wayfairing Temple for $1.49. I would recommend both.
To get the full effect of the Urzatron you should put in Urza's Tower other wise having four of the other two is kind of pointless.
try adding a couple scourned villagers to help with mana production, the Simic Keyrune might help too.