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card
watcher
power
uncommon
Mental fortress is a build around card that requires you to take many stance change effects. Note that exit also counts as a change of stance. Obviously, this card synergises extremely well with flurry of blows, as not only are you generating block for changing stances, but most of the time you will also drawing an additional attack. Multiple copies of this make the effect even stronger, in many cases meaning you don't need to use block cards. Note that this strategy can be fairly inconsistent, as if you do not draw the stance change cards that you need you will often die on the same turn. I would not include mantra cards when employing this kind of strategy.

Bronze Scales
common
Start each combat with 3 Thorns.
C

Frozen Egg
uncommon
Whenever you add a Power card to your deck, Upgrade it.
B+

Mercury Hourglass
uncommon
At the start of your turn, deal 3 damage to ALL enemies.
C

Mummified Hand
uncommon
Whenever you play a Power, a random card in your hand costs 0 for the turn.
B-

Runic Dodecahedron
uncommon
If your HP is full, gain 1 Energy at the start of each turn.
D-

Bird-Faced Urn
rare
Whenever you play a Power, heal 2 HP.
B+

Calipers
rare
At the start of your turn, lose 15 Block rather than all of your Block.
C-

Gambling Chip
rare
At the start of each combat, discard any number of cards then draw that many.
A

Thread and Needle
rare
At the start of each combat, gain 4 Plated Armor.
A

Torii
rare
Whenever you would receive 5 or less unblocked Attack damage, reduce it to 1.
C+

Stone Calendar
rare
At the end of turn 7, deal 52 damage to ALL enemies.
D
No watcher, colorless or curse cards antisynergies.