To determine the total cost of a spell, start with the mana cost or alternative cost you're paying, add any cost increases, then apply any cost reductions (such as that of Swampsnare Trap)
Then use Pestilence and other cheap sweepers to exile the creatures, giving you a bunch of Rats
More about the story should be revealed soon in interviews and videos as with the last few sets
Kozilek, the Great Distortion Again a colorless cost of 10, but this time 2 have to specifically be colorless
Did I mention that it has flying, making it hard to block
Advanced Search Sets Random Syntax Showing 1-5 of 5 cards: "set name: FIN, type: Instant, colors: includes B" Display: Card Small Sorted By: Card Name Ascending Showing 1-5 of 5 cards: "set name: FIN, type: Instant, colors: includes B" Fight On