Flooding is useless, when would you ever take it in a general deck?
This is true for a lot of cards.
List 10 of these cards.
Dagger
Nightmare
Virus
Skeleton
Ash Eater
Damselfly
Gnome Rider
Skull Buckler
Solar Shield
Luciferin
Anyway. I believe Flooding is supposed to make a total field lockdown combined with the many sources of Freeze Water has.. Flooding + 2 Squids -> only 1 creature will be able to hit you. I don't know how to buff it - it is too situational. Decks that use more than 7 creatures are rare. Perhaps it needs new cards to become more powerful/used.
dagger is for newbies to farm...
nightmare is useless, i will have to agree, except to limit ur opponent's fractals, i guess
virus is upgraded is not that bad in a bone wall deck (combined with plague, it's actually very good)
skeleton is just for mutation (in rainbow decks, using bone yards to summon them, and mutate them)
ash eater is indeed very useless, but it's a free immolation/cremation
gnome rider, if upgraded, can serve as earth pillars
skull buckler is truly useless...
solar shield is truly useless...
luciferin is very good in hope decks