Check me if Im wrong guys, but I think the cheapest "good" deck to play is probably the breloom/scramble and time machine comboed with something like magneton or togetic or both. Its a real cheap strategy, the cards arent hard to get and it can really take advantage of the weaknesses of some other decks. EX Battle Stadium has alot of cards you might want, dunsparce and celio+tv reporter among other things. The two good theme decks in my opinion are the wishmaker from HL with jirachi and the Charmeleon FR/LG deck.