Bone wall does have weaknesses. If you have alot of creatures it will just get destroyed. Simple as that.
But WITH Sundial and something to destroy creatures such as Lightning and Otyugh, then it is really strong. But that's what's called STRATEGY.
Spamming sundials is called strategy now?
A bone shield can stand forever like that. If the oppnent is using a similar sundial based strategy, he might have a chance, otherwise he will be overrun whenever the sundial player thinks he is ready. I don't like the development, bone wall is ok, sundial is not.
1st of all: Spamming sundials is an easy way to waste them.
2nd of all: I shall name some bonewall weaknesses.
1st weakness: Summon creatures and wait, it will fall...and as it's damage inconsiderate, even with photons that cost nothing to summon will obliterate it
2nd weakness: Boneyards completely negate it (Example: He destroys your creatures, more skeletons pop up and obliterate his walls)
3rd weakness: FFQs (After Turn 1: 1 wall taken down, Turn 2: 3 walls taken down total, Turn 3: 6 walls taken down total, Turn 4: 10 walls taken down total, Turn 5: 15 walls taken down total) <--- With just 1 FFQ and a few life quantums
4th weakness: Doesn't matter how many walls are up, if you kill their creatures, it will fall (just don't deck out by drawing like a maniac)
5th weakness: Stealing works better than most people think (Have one bonewall up, then use spells or otyughs or mutants to destroy his army. You will likely only be a few bonewalls short of him, but as his creatures are gone, you can just batter away at his wall.) (I won against a 25 bonewall disadvantage this way.)
6th weakness: More costly than other shields, so depriving the enemies of quantum works very well against this, especially against rainbow decks that don't have death pillars (Use devourers, earthquakes, defragrations, pulverizer, etc.)
7th weakness: Pulverizers (As the wall blocks weapons as well as creatures, the pulverizer can destroy 2 walls every turn, and in four turns, the wall is gone [Not including creatures on the field, and this also works during stasis (sundial's automatic effect)])
These are some weaknesses that took very little time to think about, so there are probably more. Even if there aren't, 7 weaknesses is pretty easy to exploit.
Sundials + Bonewalls
Who says stasis can't work in your favor?
If you have otyughs, mindflayers, lobotomizers, lava golems, boneyards, fallen elves/druids, low quanta, dissapation shield/field, devourers, fate eggs, FFQs, Forest Spirits, hourglasses, etc, stasis time can be very beneficial to you. While they hide behind a sundial, you can take advantage of this by using abilities activated every turn. This can give you super buffed creatures with high attacks and strange abilities, destroy his army/make it useless, create an army that will instantly destroy his bonewall, gather quanta for cards like miracle/dragons, or give you enough quanta to hide behind a dis. shield/field (If added with an encahnt artifact, it can make you nearly invincible while his shield only protects him for a turn or two).