With a deck like Thoazol's I've gotten over 300 points in a DM once. Doesn't always win, but is definitely the easiest and cheapest way to get lots of points, at the loss of the meaningless win/loss ratio. If you're worried about price there's not much you can do, Extended and even e25 are packed with decks that are expensive and strong.
• Anything that has high 2HKO potential and a decent amount of power passes as a Deathmatch deck.
•Best mode to start off in would be Standard Dm if you're talking about how much a good deck would cost.
Find your own playstyle to play around. Other people's suggestions are not always for you. and anyways, you become a better player off experience, everyone makes mistakes and research what their playstyle is. And once they achieve this, they truly become someone to fear when you see them in DM.
Standard DM is easier and you can do alright with a cheapish deck. Try Vortex clan or Sakrohm / Uppers and use Hugo or Morphun as Leader . And what Asian said^.... (I remember seeing him in DM quite a few times and I knew I was gonna get my butt kicked lol)
Urban Rivals | Free Online Manga Trading Card Game | TCG | MMO
The Urban Rivals team is made by lovers of all kind of Collectibles Cards Games and Trading Cards Games like: Magic the Gathering, Dominion, Vampire, Yu-Gi-Oh!, Pokemon, Wakfu TCG, Assassin Creed Recollection, Shadow Era, Kard Kombat and Might & Magic Duel of Champions.