If a nontoken permanent is put into a graveyard, it doesn't matter what happens to the permanent card afterward
If you have creatures utilizing charge counters (such as Spacecraft), you can move them to other ones if needed to make them all fully stationed to have them at full power
On the other hand, for products like Secret Lair drops, Commander decks, or other preconstructed / box-set supplemental products, we used the cost of buying the sealed product (which is generally lower than the cost of buying all of the cards in the product individually) from around the time the set was released (for sealed product, you'll often pay much more if you wait until the set goes out of print to try to buy it)
Youd choose whether to use their doctors companion pairing or their partner with pairing, but not both
For example, if you put Null Profusion (an enchantment that says your maximum hand size is two) onto the battlefield and then put Spellbook onto the battlefield, you'll have no maximum hand size