They can shoot fire, enchant the world, dissolve stone or steel, and even nullify a spell in progress
From there you can spend your mana to kill your opponents with tons of the combo pieces like Makeshift Munitions, Hissing Iguanar, or Flamewave Invoker
When you buy Elite Trainer Boxes, you often get a bunch of Pokemon branded sleeves for your cards also, though you may find these not as silky as the Ultra-Pro ones
While "Polymerization" is in your GY, your opponent cannot target this card with card effects
Another thing I heard from many of the people whom I spoke to was the importance of limiting the number of copies of cards in their collections: Jesse Lyons from Castles and Cooks and jestergoblin: I generally keep four of each card with the exception of staples, like Brainstorm or Counterspell, where I have around twenty copies. Adam Styborski from pretty much everywhere but primarily GatheringMagic and DailyMTG.com: I sell/trade most of my rares and valuable commons/uncommons
