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card
watcher
attack
common
Flying sleeves is a solid filler card. Although it doesn't deal a great amount of damage, the fact that it retains allows you to play it on turns where you are in wrath or divinity. Also, since it has a multi attack, it benefits more from strength than most other cards. Although I wouldn't pick more than one of these, having one copy for act one is usually fine.

Vajra
common
At the start of each combat, gain 1 Strength.
A+

Molten Egg
uncommon
Whenever you add an Attack card to your deck, it is Upgraded.
A-

Shuriken
uncommon
Every time you play 3 Attacks in a single turn, gain 1 Strength.
A

Sling of Courage
shop
Start each Elite combat with 2 Strength.
C-

Akabeko
common
Your first Attack each combat deals 8 additional damage.
C+