The last time we saw this mechanic return to a regular set was Coldsnap in 2006
Zendikar Rising also sees the return of the Kicker mechanic, where you can put extra mana into spells to do extra things
Commons made up the bulk of the pack, uncommons gave you a few stronger or more focused options, and the rare slot was where the rest of the pack was leading up to
it can also stick around as a permanent part of your board if energy equal to the cards mana value is paid
Where Ooze really has the potential to shine is with blink shenanigans, as it blinks far better than Skyclave Apparition does
9.4 In respect of Lots that are not V Lots, the Company indemnifies the Seller against some risks arising from fire and other insurable perils, theft following forcible entry, hold up and water damage to the extent of the Company's insurer's liability to it in that regard