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Segmentation Wurm
X
Artifact Creature - Wurm
Haste
Miracle X
This creature enters the battlefield with X +1/+1 counters.
: Create a token that is a copy of this creature, it enters the battlefield with Y +1/+1 counters, Y is 1 less than the number of +1/+1 counters on this creature. Use this ability only once.
0/0

Why did you choose to use the variable Y instead of X? Since you defined the variable with a clause in the ability. I don't see where the confusion would arise. It kind of looks weird to use two different variable when there is no cause for confusion between two seperate instances. If you didn't define the second one, I'd understand, but you have to anyways so why not keep it all linar by only using X as your variable here?

can be cast for purely colourless seems somehow wrong.

I meant to make it an artifact creature, corrected. It's still a bit odd, I probably don't mind that, it seems plausible.

by 2X do you mean ...?

Thats right, the MC tags don't work with X properly. I mean 2 then X, it's not as much smaller than the non miracle cost as one might expect, but do miracle costs always have to be ridiculous.

Why not just not give it haste, and have it produce the copies as a triggered effect?

The original idea was that it occurred on entering the battlefield, a whole series of triggering, an experiment into recursion. However making it optional seemed to add expressive possibility, particularly when combined with haste, you may want to attack for example and save some generating for later, instead of making everything but the 1/1 tapped this turn.

The problem with this is memory, how do I know later what abilities I can use again, it's maybe a bit steep, and it would be neet to do it the triggered way instead. I considered as another possibility having it not untap during untap steps and being able to attack while tapped, or untap but just to attack.