Tetravus

Flying
This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from this creature. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and "This token can't be enchanted."
At the beginning of your upkeep, you may exile any number of tokens created with this creature. If you do, put that many +1/+1 counters on this creature.

Masters Edition IV

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.

Renaissance

Rinascimento

Fourth Edition Foreign Black Border

Fourth Edition

Flying
When Tetravus comes into play, put three +1/+1 counters on it.
During your upkeep, you may move each of these counters on or off of Tetravus, regardless of who controls them. Counters that are removed become Tetravite tokens. Treat these tokens as 1/1 artifact creatures with flying. These creatures cannot have enchantment played on them and do not share any enchantments on Tetravus.

Any +1/+1 counter which is on this card can be turned into a Tetravite token. It does not care where the +1/+1 counter came from.

If the Tetravus is destroyed when the Tetravites are off the card, they are not destroyed, they are just orphaned.

Only Tetravites from this specific Tetravus may be used for the ability. Ones from a different Tetravus can't.

This card now has two upkeep-triggered abilities. Its controller chooses the order they are put on the stack, and thus the order in which they resolve each upkeep.