I found this combo on MTG Daily. Not only is it a really cheap deck, I think it's pretty fun too. (I have some mythic rares in this version, but this deck is still amazing without them. If you want to keep it under $25 just replace the expensive cards with 3 Wolfbriar Elementals, 2 Join the Ranks, and some basic lands. I just put mythics in because I haven't had a chance to play with them yet, and I wanted to try them out.)

In order to get the infinite combo, you must have a Harabaz Druid in order to generate blue mana. Then, you need a Turntimber Ranger. Finally, you need a Xenograft. When you play Xenograft, declare "ally" to be the chosen type. The next time you play an ally Turntimber Ranger's ability will trigger, generating a wolf token, which is now an ally, which will trigger Turntimber Ranger's ability again, and again, as many times as you wish.

Infinite wolf tokens is not the only benefit to this combo, though. Any ally you have out will have its ability triggered as many times as you want. You can also get infinite +1/+1 counters (works especially well with Graypelt Hunter--trample ^^). If you have an Ondu Cleric you will get infinite life (remember, Ondu Cleric's ability triggers for every ally you have, so if you make 500 wolf tokens you won't get 500 life, you will get life according to the following formula: SUM(i) as i goes from x to n, where x is the number of allies you have and n is the number of wolf tokens you generate. Example: You have 5 allies on the board and one of them is an Ondu Cleric. You generate 500 wolf tokens with the combo, so you gain 125,240 life.) Sea Gate Loremaster can let you draw as many cards as you like, you just have to be careful not to draw your whole deck (unless you are sure you can win that turn). And finally, Hagra Diabolist will just flat-out kill your opponent.

Believe it or not, Harabaz Druid is the backbone of this deck. If you don't draw any, or they get destroyed, it makes things much harder. If I don't have a Harabaz Druid and a Forest in my opening hand I usually mulligan. Other weaknesses of this deck that I've found include fliers and Day of Judgement. Plummet and Gravity Well in the sideboard help with fliers, and Fresh Meat is the best answer for Day of Judgement that I can come up with. Elixir of Immortality helps defend against mill, and Vines of Vastwood and Asceticism help against removal spells. I sideboard Creeping Corrosion in case my opponent is heavy on Artifacts, and Fog is there just to piss off my opponent.