[1 CREAT] (Aggrofact)

(Aggrofact)

Artifact Creature
At the beginning of your upkeep if there are three or more +1/+1 counters on ~ sacrifice it, otherwise put a +1/+1 counter on ~.
1/1

EDIT: Fixed up wording, card works the same as before just more clear.

So it gets to attack once as a 2/2? That really doesn't seem worth the card. Maybe if it was "At EOT if this has 2 or more counters, sac it" that way it would get to attack twice.

The wording is a bit unclear. It can attack as a 2/2 or a 3/3.

Looks much better. My suggestion to change the card.

Lego-man
Artifact Creature - Golem
Lego-Man enters the battlefield with a +1/+1 counter on it.
At the beginning of your upkeep if there are four or more +1/+1 counters on ~ sacrifice it, otherwise put a +1/+1 counter on ~.
When Lego-Man dies you may move it's +1/+1 counters to another artifact creature.
0/0

I think your card is too powerful. I enjoy the modular part of it but it being a 0/0 with +1/+1 on it makes it too powerful and too text excessive.

Modular might be too powerful on a 1-drop creature that grows. On the other hand, it encourages drafting artifact creatures, of which there usually aren't too many in a cube. Could be a neat design space to put in here as a 1-of.