creature + bb = u block 5 damages, and blocking five damages shut down a lot of decks; can be used in a mono deck, and this is really too much.
the
one give u a gigantic card advantage and rt if u are lucky, if every attack is one card
is even better than the earth one, bypassed only by sofree or poison (and big creatures), easily fueled by bb on something or with a sofo.
the point of sacrifice a creature when u have fog shield that does the same thing? even if i turn a huge 20/20 wyrm for a more miss chance, is probably better keep attacking than put a shield up
u have sog and heal in the same element, 50% to get one hp is nothing
too similar to fire shield/buckler, if burn= 1 damage/turn
rebalance these six imo