the lower the ranking, the more decks the card is played in.
Once you stockpile 10 and make it to your next upkeep, you win the game outright
Tarkir: Dragonstorm Commander (TDC) and Special Guests (SPG) are Commander-, Legacy-, and Vintage-legal sets, and individual cards are also legal where already available in other formats
On the positive note when it comes to tournaments in particular you can just focus on the game and because the various event based tournaments are not precisely linked by specific players, you can participate in these events at whatever pace you like
Delina, Wild Mage Youll always get one, and sometimes youll get more
Toggo just gives them to you for every land drop, so you don't need to be a dedicated landfall deck, but slipping in some artifact or permanent sacrifice payoffs is a really good idea