Moonshae Pixie Want to hit hard and fast with big hitters that would otherwise be blocked
And even in a stalemate, it can also produce a creature to break through an opponents defenses either by attacking a player directly or transforming into Zilortha and negating whatever blockers they might have
It draws you cards and slows down your opponent (Blue), and kills your opponent's creatures before they can cause a fuss (Black)
Theres also the madness mechanic, and cards with madness are often better when you discard them and cast them for the madness cost
What affects the value of The Ur-Dragon
In Magic , it's a 4-CMC 3/4 creature with flash and flying, and it also has the ability to airbend any number of other nonland permanents you control, which can be a great defensive tool against a board wipe or a combat trick of sorts