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, create that many 1 1 colorless Tetravite artifact creature tokens. They each have flying and This creature can t be enchanted.
At the beginning of your upkeep, you may exile any number of tokens created with Tetravus. If you do, put that many +1 +1 counters on Tetravus.