For modern cards Im collecting (not selling), I use CGC to save money
Always remember to de-select the Darkness-type energy from the Deck Menu, as it will only lower your chances of getting Water and Electric-type Energies, and you should never attack with Weezing in the first place
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It's also legal in several formats including Commander, Legacy, Modern, and Vintage
The barrier to entry is steep (individual PSA 10 holos are $5,000-$264,000), the market is illiquid, and condition is everything
1 I have not played Woodwraith Corrupter, Trestle Troll, Rites of Reaping, and Odious Trow.