*Brainstorm of decks and flooding*
Ghostmare has 6 creatures, lava rushes can immolate anything weaker if they run out of space, pestal might still be able to deny it, graboids can still finish with 5 creatures, CCYB often finishes with a single quinted lava destroyer, ghostal can just wait to two turn kill (9*5=45+eternity damage=two turns instead of one, not a big difference). Firestall and the Rage Quit Deck don't have any creatures. I'm not sure about fractix, does it check once per turn for flooding? If so, you can respawn them each turn. Poison and neurotoxin don't need that many creatures.
Pharaohs, FFQ, fractal of other creatures, RoL/Hope (might still win if flooding comes late and you can multi-fractal a dragon) are destroyed by flooding in one turn. But that's only 6-8 damage less than Flooding before.