Cheapest priced copy (Fourth Edition): $1.49 at Card Kingdom, near mint, their price list as of .
Tetravus 
Artifact Creature — Construct · 1/1 · Rare · Fourth Edition · #350
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.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
5 printings · $1.49 to $37.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Fourth Edition Foreign Black Border | 350 | Rare | — | — |
| Fourth Edition | 350 | Rare | $1.49 | — |
| Antiquities | 71 | Rare | $37.99 | — |
| Renaissance | 161 | Uncommon | — | — |
| Rinascimento | 141 | Uncommon | — | — |
4 rulings from Wizards of the Coast
- 4 October 2004Any +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.
- 4 October 2004If the Tetravus is destroyed when the Tetravites are off the card, they are not destroyed, they are just orphaned.
- 4 October 2004Only Tetravites from this specific Tetravus may be used for the ability. Ones from a different Tetravus can't.
- 1 August 2008This 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.