If you run quickly through light you'll notice a few easy and fast counters. You don't need to pick something that works well with your element, you need to pick a counter to your own element and put it into effect within the Countered Element itself. Grav. Shield is a option, like Ryan said - Grav. Shield counters pratically all light creatures.
Now look at a few of my decks. Antimatter is a perfect counter to all creatures in light except for Morning Glory. Let the opponent bless himself and then heal yourself by double if it's a pegasus. Fairly easy.
Now let's look at light again. Light has Miracle, a much used card. So what counters Miracle? PC, or Pillar Control. Packed some EQ's and I beat a miracle deck, easily. As well as other creatures - Light creatures cost a lot, normally. Except for Ray of Light that is free.
And looking at light again, you could of use deflagration - You could even input rage pot's. Rage Pot + Angels isn't only effective, but it's commonly used and splashing in a deflag or two wouldn't be hard, and you'd counter shields like Fog Shield (Pegasus Rush), Solar Shield (Light Production) and Grav. Shield (Stops light completely.)
