Three mana for a 2/1 and steal your Sol Ring
For more on the best deck size, interesting large deck cards, and an intro to formats and card sideboards too, read on
But they'll have to fly through a war zone to get there.
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
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
Card Cavern If you have a variety of singles individual Pokmon cards, not full packs selling them to Card Cavern might be best