We also got to see multiple versions of Final Fantasy 7 icon Cloud Strife one card in the main set, another card leading a Commander set
Self-mill effects, dredge, or cards that let you discard specific cards are great ways to feed your graveyard with precision, so, if you use these resources, you'll be able to copy exactly the permanents you want
That said, its a lot of mana to cast, so you really need to go out of your way to enable it
If a player or permanent has more than one kind of counter on it, and you choose for it to get additional counters, it must get one of each kind of counter it already has
You can't wait and play them later
Into the Inklands had two rules cards per pack, explaining the new Locations mechanic