Increasing the number of Permanents in the game...
Decreasing the playability of PC...
doesn't get hurt much from this nerf..
still has Steal..
Seems like a 10 element nerf.
(Also, cheap PC isn't a bad thing because you can only have 6 copies of it in your deck, while a lot of decks have far more permanents, excluding Pillars/Pends.)
Fire does get hurt by this change. Mono fire does not, duo fire is hurt only slightly, but fire as a whole is.
Also, regarding splashability. If there were, say, 4 more PC cards along the lines of Steal in (not so random example choices)
, would it be that bad? More than half of the elements would have ways to dispatch permanents, the rest could "splash" them without actually splashing, but rather through synergetic duo decks. Meanwhile, unupped rainbows (AKA novabows AKA dominant decktype 003) are nerfed.
Besides, you can still play Deflagration off of Mark in an otherwise mono deck. 3 turns before dispatching a permanent is enough to get rid of Phase Shield chains almost completely, and other shields or important permanents can be deflagged in three turns too. Not bad at all, if you ask me...