Any deck can be competitive, but if you want an actual playable deck that you can afford then why not drop the high dollar stuff in favor of cards that have similar effects or that work just as good? Also even though you have a lot of high dollar cards in this deck there isn't much synergy in this deck.
For example:
Tarmogoyf is a creature that you'd have in a deck that utilizes semi-mill tactics and possibly even delirium tactics if you wanted to make it as large as possible in a quick fashion. Now if you focus on the
Kalonian Hydra +
Master Biomancer then you'd have a good engine going where all of your creatures would enter
larger than life.
Now if you delved deeper into the older sets you'd find some diamonds in the
rough that would make this a competitive deck.
Alpha authority,
burst of strength,
crowned ceratok,
death's presence,
druid's deliverance, and even
forced adaptation +
fathom mage are all from the same block and can be used effectively in this deck (Ravnica).
Archetype of imagination would be a great late game surprise that your opponent will not expect after you've spent the entire game beefing up your army.
Fleetfeather Cockatrice is a
dangerous creature where G/U comes together to make a GROWING DEATHTOUCH FLYER. All of these are from (Theros).
Artful dodge will make your biggest threats hit home with more accuracy,
Ghostform is similar but it effects TWO creatures instead of just one,
Ghostly flicker is a great combat trick for creatures that have enter the battlefield effects or if you want to save someone in combat, and my personal favorite is
howlgeist whom if you keep making stronger will become nearly unblockable (Innistrad).
These are all recommendations for your deck that would not only drop the price but also make it more feasible to put the deck together. Your deck idea is not bad, but if you want an actual deck to play then why not try these ideas?
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