Paul's card beat its own record earlier this year when he sold it at auction for an incredible $16,492,000
In addition, rare cards will have more exciting and valuable effects on spells, monsters, and traps
A maximum of one nonbanding creature can join an attacking band no matter how many creatures with banding are in it
Mox Sapphire doesn't do anything more than provide a single blue mana, but the fact you could play as many of these artifacts as you wished on the first turn meant it was theoretically possible to have far more mana than your opponent if you received a lucky draw
Is there a line of play where Shelldock can mill an opponent instantly
An example is the Blue-Eyes White Dragon card, where you sacrifice two monsters to summon