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card
ironclad
skill
rare
Double tap is typically much more effective on expensive attacks, since the second time it is played it is played for free. Obvious choices are bludgeon, searing blow, and carnage. Cards that apply vulnerable benefit from the damage boost on the second play. This card can also get greater value out of Reaper. Also synergises with relics that work based on attacks played, such as Shuriken, Kunai, Pen Nib, etc.

Pen Nib
common
Every 10th Attack you play deals double damage.
A

Kunai
uncommon
Every time you play 3 Attacks in a single turn, gain 1 Dexterity.
C+

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

Toxic Egg
uncommon
Whenever you add a Skill card to your deck, it is Upgraded.
A-

Runic Pyramid
boss
At the end of your turn, you no longer discard your hand.
A-

Ink Bottle
uncommon
Whenever you play 10 cards, draw 1 card.
D