I wanted to contrast Dim. shield with other shield, but it's can't be, because it's much better than the others.
In upped it has no enemies, for 5 it saves your life and in 3 turns dragons (+Sow) and Psions can take your opponent out. If the unupped not, the upped surely needs nerfing.
But see the difference in 3 turns (in unupped race) against 3 Horned frog (with NO weapon and it's really the early game, so the dimensional is handicapped enormously).
I, Dissipation shield

/ Bone wall against Dimensional shield

That both negates the attack, but the Dimensional for 6

, the Dissip. cost 3+9

.
Dissip field works half effective.

won.
Against Bone wall is nearly the same, but Bone wall costs a little bit more and you take 6 damage, after the wall is destroyed. But the wall has very good PC protection (the second best in the game) and it's can be combosed. I like Bone wall, so it's row.
II, Titanium shield

against Dimensional shield

You defended 18 life for 4

or all for 6

. Titanium works as effective as Dimensional, but it's weaker, because it's 'smaller'. 2

is not much bigger price for defending against nearly any monster.
III, Solar shield

/ Emerald shield

/ Hope against Dimensional shield

: 18 damage dealt to you and got 9

in positive. That nice, but it's not really shielding. In emerald, you get no

, just spell invulnerablity.

absolute win.
IV, Skull buckler

/ Thorn carapace

/ Dusk mantle

/ Fog shield / Ice shield/

against Dim. shield.
First, the Dim. shield not gives chance, it defends.
Skull buckler kill 3 HP creatures (as I know 0.5/HP ) 16,7% chance. That means in 3 turn 1.5 creature dies. Chance counts AFTER hit. That 6+6+4=16 dmg for taking 4

in your pocket (11 life saved). The buckler is very cheap and killed 1 or 2 creature, what can't harm you anymore, but very slow. Dependable on the player,

or

both can be good, but in this situation

won by it's very low cost (counted up to 6

, it's 22,2% more efficient as Dim.) and killed 1 creat. But you got a lot injures.
Thorn carapace seems very efficient, but it's can kill the creature till the end of the 3. turn, so it's 27 for 'nothing'. OC it's killed 1,7 creature too and will kill the others in 1-2 turns. The Dim. shield is cheaper and I'm not die in the way to kill creatures.

wins
Dusk mantle

/Fog shield defends you from 13.5/10.8 damage. Fog shield seems better by it's low cost, but it's haven't done anything despite being cheap (Skull shield killed), and you are not in safe, so I choose

for winner.
Ice shield can freeze by 30% (in this example 1/3) and shields too. After 6 freezes 1, after 4 2 is freezed and in the 3. turn all of them is frozen. Prevented 15 dmg and frozen 3 creature. In reality every creature have 34.3% to be not frozen, so 1 takes it warm. And the not die, just freezes. But compared to the other shields it still very good, but not as good as Dim. for the same prize. Good CC, but in shielding now

won.
V, Fire shield

, Procrastination

against Dimensional shield.
Procrastination

can be the same, because is only every 2. turn, but 2 shields prevents you for 6 turns for 12

and Procrast for 6

does it's half. But that doesn't counts newly played creatures, not kills them and you still gets injured.

won with a tiny bit.
Fire shield not defends, but kills this creatures. I like this ability, but you can die very easily. But better CC than Procrast. I like Fire shield more, but Dim. shield in shielding (only in defending) beats it.
VI, Reflective shield

/ Hope

/ Gravity shield

against Dimensional shield.
Just to go though every card. None of them defends you at this situation and the are sh*t as hell for cheap.
Hope indestructible and has a very strong and cheap combo, but in itself, not good. And not cheap.
Normal Shield is prevents 9 for 1

. Pretty, but it's the best quanta/defend rate in this simulation.
After all, in this weakened play, Dim. shield crushed nearly every other shield and there only just better situation (Adrenaline, Blessings and Mitosis).