Tetravus

Flying

At the beginning of your upkeep, if you control no Thopters other than this creature, return this creature to its owner's hand and create five 1/1 colorless Thopter artifact creature tokens with flying.

This creature enters with five +1/+1 counters on it.

, Remove a +1/+1 counter from this creature: Create a 1/1 colorless Pentavite artifact creature token with flying.

, Sacrifice a Pentavite: Put a +1/+1 counter on this creature.

Flying

This creature enters with three +1/+1 counters on it.

, Remove a +1/+1 counter from this creature: Create a 1/1 colorless Triskelavite artifact creature token with flying. It has "Sacrifice this token: This token deals 1 damage to any target."

This creature enters with seven +1/+0 counters on it.

At end of combat, if this creature attacked or blocked this combat, remove a +1/+0 counter from it.

, : Put up to X +1/+0 counters on this creature. This ability can't cause the total number of +1/+0 counters on this creature to be greater than seven. Activate only during your upkeep.

At the beginning of your upkeep, put a doom counter on this artifact.

At the beginning of your draw step, this artifact deals damage equal to the number of doom counters on it to each player.

: Remove a doom counter from this artifact. Any player may activate this ability but only during any upkeep step.

Flying

This creature enters with four +1/+0 counters on it.

At end of combat, if this creature attacked or blocked this combat, remove a +1/+0 counter from it.

, : Put up to X +1/+0 counters on this creature. This ability can't cause the total number of +1/+0 counters on this creature to be greater than four. Activate only during your upkeep.