Here's an example
In theory, with a Naban, Dean of Iteration on the battlefield, you only need half the number of blue mana symbols on the battlefield to make Master of Waves good (for example, in the worst-case scenario where you have just a Naban, Dean of Iteration and a Master of Waves, you'll still end up with 10 power across five bodies, which is a pretty reasonable deal for four mana, and if you throw just one other Wizard into the mix, things cat get out of hand really quickly when Master of Waves' enters-the-battlefield trigger is doubled)
When they leave the battlefield (like if theyre bounced to hand or go to the graveyard), they cease to exist
Number 8: No
For example, a miscut card will have a low centering sub-grade but potentially high sub-grades for surface, corners, and edges which tells a potential buyer that the card is in great condition apart from the centering error
Aven Interrupter While Jace Reawakened is more all or nothing, Aven Interrupter is a solid play