Here's the deck I used last weekend to handle Guild Enforcers and get a legendary card pack. Details below.
Guild Enforcer is an incredibly strong card. There are planned changes in the works, but not for this weekend. As such, you need answers for it as you will definitely see it. This deck is full of them (and uses GE as well).
The deck is bimodal with really strong cards at 2 mana and at 4-6. If a Guild Enforcer is dropped on turn 4 (earliest possible), you have several answers:
If GE shows up on turn 5 or 6, more answers open up
These cards are all solid mid-range cards in their own right, so the deck isn't built just for GE. At 4 mana, Rhinos and Cyclops provide a ton of bulk. Early game is incredibly strong with
These cards are so strong your opponent may mistake you for an aggro deck, but the deck actually peaks at 5/6 mana.
Try to hold this card in reserve and establish board control without it. Then, when a big create or Guild Enforcer is played by your opponent onto an empty board, Lightning Strike is the perfect answer. The exception to this is if you've identified your opponent as an Aggro player with lots of weaker creatures, but be careful, many of these are running GE, too!