Number 1 Was there any question
The same is true for creature spells you control and creature cards you own that aren't on the battlefield., : Create a 2/2 blue Shapeshifter creature token with changeling
One major thing to keep in mind is that your seven lands have to have different names, so if you have six Forests and then play Field of the Dead, not much is going to happen
Si can be paid with one mana from a snow permanent.) If a creature would deal combat damage to you and/or one or more creatures you control, prevent X of that damage, where X is the number of age counters on Cover of Winter
Heres an example, a subtle one no less
Some specific combos to be aware of: Playing lands from graveyard: Ramanup Excavator or Crucible of Worlds or Ancient Greenwarden plus Strip Mine, Wasteland, and playing extra lands per turn Azusa, Lost but Seeking or Courser of Kruphix or Dryad of the Ilysian Grove or others can get really, really mean