A player loses the game after having been dealt 21 damage from one of them, not from both of them combined
For more on the best deck size, interesting large deck cards, and an intro to formats and card sideboards too, read on
Card Cavern If you have a variety of singles individual Pokmon cards, not full packs selling them to Card Cavern might be best
Every time you cast a legendary spell from your hand, you get to functionally cascade through your deck until you find another legendary spell with a mana value less than your first spell, then you get to cast it
I especially like this because Im a history student and absolutely love the classics
You can also play the Elder Dragon in the 99 as a way to untap lands with Lord Wingrace at the helm, so you can ramp into bigger spells such as Torment of Hailfire for the win