Hey thanks for the commment :) Glad you had fun! It is great to read your experience :D
Ahah yeah, summons can lead to chaotic or completly stuck states ^^’
And you are right, terrain-related triggers (among others) are too rare to be useful. Since some others can easily be activated once per turn in any situation. So no reasons to choose them. Maybe the solution is to only make triggers hard to activate. Or add a power value that would be used by the effect part, to balance the rarity.
Maybe one day I will come back to it to make a new version :p