With Gatherling you can keep track of your decks in order to see what you played last tournament, last month, or even last year. You can keep track of all of your decks played here at the Gatherling.com tournaments, and Gatherling will keep a record of how they do.
Scryfall is a powerful Magic: The Gathering card search engine. It allows you to search by MTGO tix price as well, making it a great tool for finding budget cards, or getting deck ideas.
The Mothership also has a seperate section for MTGO articles, where you can see what the latest updates have changed, cards are added, tournaments to come etc.