submerge is like burrow, but for amphibious creatures?
Yeah, I think there is a card in the crucible that explains it.
equal to the attack +2?
^This. I personally see this creature as a small one, so probably cost 3
![Water :water](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/water18x18.png)
with 1 | 2 / 2 | 2 , ability cost 1
![Water :water](https://elementscommunity.org/forum/Smileys/solosmileys/../../../images/Misc/water18x18.png)
for both.