Suggestions to define poll:
1. Permanent which makes creatures affected by inundation untargetable (but affected by fire buckler, Permafrost, etc)
2.
a) Spell that 1 for turn doubles the water elemental creature's damage (kind of a blitz card for water)
b) Spell that 1 for turn water elemental creatures become untargetable
3. Spell that permanently doubles a single water creature damage (doubles the damage, it doesn't make it attack twice)
