There are six basic land types. Wastes is the 6th. A Wastes has "Tap: Add C to your mana pool."
The last step of a library being searched is for it to be shuffled by its owner. 'Shuffle your library' is left off of cards that search your library in TumbledMTG, and it's simply assumed it must always be done by the library's owner.
'Mill' is now a keyword. To 'mill X cards', put X cards from the top of your library into your graveyard.
If a noninstant, nonsorcery (ie, creature, enchantment or artifact) spell is copied, the copy will behave much like you would expect a normal spell of that kind to behave. When it resolves it will be put onto the battlefield as a token permanent.
A 'nonflash ability' is an activated ability that can only be activated when you could play a nonflash card.