Pray requires a cost to activate. Do you mean, you just get a free pray activation or you have the chance to activate a pray?

could you just have it as 'pray 0'?

The idea is to use it more like a keyword action instead. Of course if it was only an activated ability, this card wouldn't work.

A lot of evocative stuff could be done with a keyword action:

"Whenever a nontoken creature you control dies, pray."

"Whenever one or more creatures you control attack, pray."

While a lot of design can occur with a modification to the way we are approaching pray, that comes later, if our current iteration proves to not be sufficient. I am not a fan of this card at this stage of design.

I personally think it would create more insight more quickly to use both variants in tandem and cut the triggered version if it does not provide the wanted gameplay.

suggested edit:

2W

~ ETBs with a +1/+1 counter on it.

Remove a +1/+1 counter from ~: Pray.

2/1

may be too complicated depending on how NWO you want to go but this seems like a possible fix to me. at the same time my set's all about counters, so i might just be skewed too far in that direction when i think of ideas

We are cutting all cards with this style of pray except for the GW rare slot.