There are plenty of resources on this topic around, but none which both span the whole history of the TCG and employ a consistent methodology
Theres been plenty of debate over the years about Palinchrons anatomy
Designer Notes: The Ur-Dragon is a great way to play all your dragons early by reducing their cost, while also helping you draw cards and finish out the game once you get to 9 mana
lacking the traditional MTG card back design, you may be asking yourself: how do you even build these cards into a deck to be played
Of course, MTG Arena will handle the die rolling and tables for you, so you just get to enjoy the results, but you can read up on all the details here if you're interested
Each one contains great design compromise in terms of power, combining the functionality and strangeness I look for when I think about my favorite Magic cards