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.
Near Mint - $0.70
Near Mint Non English - $0.70
Lightly Played - $0.60
Lightly Played Non English - $0.60
Moderately Played - $0.60
Moderately Played Non English - $0.60
Heavily Played - $0.50
Heavily Played Non English - $0.50
Damaged - $0.40
Damaged Non English - $0.40