I had a causual mono green squirrel deck that was dang near impossible to beat. Everyone hated when I used it. Out of the hundred or so games i played with it i only got beat a handful of times here is the deck and I've improved on it since with an app called mtg unofficial
16 Forest
2 Liege of the Hollows
4 Arbor Elf
2 Earl of Squirrel
4 Squirrel Mob
2 Squirrel Wrangler
2 Deranged Hermit
2 Nut Collector
2 Beastmaster Ascension
2 Earthcraft
2 Druid's Call
4 Squirrel Nest
2 Crucible of Worlds
2 Coat of Arms
2 Tribal Unity
2 Parallel Evolution
4 Acorn Harvest
4 Chatter of the Squirrel
This is the new and improved squirrelmageddon deck