Create your own dragon

Somewhere in the wist there's a dragon with your name on it. Maybe a storm-black wyrm the size of a mountain, maybe a jewel-scaled drake curled around its hoard, maybe something with three heads and a very bad attitude. Place a dragon rune on the board, stack on more for wings, fire, frost, or heavy armor, choose where it lives, and summon. The wist answers with a dragon that's yours.

Give it a volcano to nest in or a frozen peak to guard. Set it loose on a knight, or let it climb alone above the clouds. Every summon comes back a little different, so the dragon you pull from the sky today will never appear the exact same way again.