FlyingTetravus gets three +1/+1 counters when cast. During your upkeep, you may move each of these counters on or off Tetravus. Counters moved off of Tetravus become independent 1/1 flying artifact creatures. If such a creature dies, the counter is removed from play. Such creatures may not have enchantments cast on them, and they do not share any enchantments on Tetravus.