Tetravus
Artifact Creature - Construct
Flying
Tetravus enters the battlefield with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from Tetravus. If you do, put that many 1/1 colorless Tetravite artifact creature tokens onto the battlefield. They each have flying and "This creature can't be enchanted."
At the beginning of your upkeep, you may exile any number of tokens put onto the battlefield with Tetravus. If you do, put that many +1/+1 counters on Tetravus.
legal Legacy
legal Vintage
not legal Modern
not legal Standard
not legal Pioneer
not legal Pauper
legal Commander
not legal Frontier