In a field of emeralds and diamonds, a cow so mad it's almost sane, shall be born.
This cow, named Bessie, shall possess the power to grant wishes, but only to those who bring it the finest of grasses.
May cause spontaneous combustion of nearby crops, spontaneous singing of nearby birds, spontaneous combustion of nearby pants (not really, just ask Bessie's lawyer)
Side effects may vary, but they'll never be boring.