See Helmsman Conjurer.

Is this a Prodigal Pyromancer with +2/+0, that deals twice as much damage, triggers ETB/LTB/death effects for you and can tap for the direct damage the turn it entered the battlefield despite summoning sickness?

Seems... like a lot.

I have yet to see why creatures would want to cooperate on the conjuring. So far only multiple Helmsman Conjurer would cooperate for that one case an 0/4 is more useful than two 0/2s. Eh?

That's a whole lot of text for a lot of unintuitive things that don't matter until they accidentally do.

I guessed wrong on what the p/t should have been.

The concept for conjure was a player building their own creature. Ideally the entire set would be an unwanted monstrosity of just creatures with conjure.

Except only one of the three cards you submit actually builds the creature, the others just do unrelated stuff if they happen to help build a creature.

This would be different btw if the amount of damage this deals was tied to the creature e. g. equal to the conjured creature's power.

Even if the number was just tied to how many conjurer's are working together that would increase the incentive to tap multiple creatures rather than tap them individually.

Food for thought.

...why would you ever tap more than no other creatures that you control?

Tap to deal 2 damage to anything AND get both an ETB and a LTB trigger, is stupid-strong.

I like the idea of "And these guys all co-operate to build a megalithic thing, and the megalithic thingy gets better each time I add more stuff" - but for that to happen, you'd need to, well, not have this. Which is just muyo goodness as the only conjurer you use.