This deck can deal a ton of damage without directly shooting the enemies, relying on destroying cards and triggering the Vengance Bullet's effect.

Strategy:
1 - Set as many shields as you can, using Purge Bullet, Backup Bullet or Rusted Bullet to parry while you gather all the bullets you need.
2 - When you finally gather all the bullets, wait for a safe turn and set both Fake Bullets in a row.
3 - Shoot both Fake Bullets, doubling your reserves.
4 - Set the Vengance Bullet on the 5th spot, Gravedigger's Bullet on the 1st spot, Sacrificial Bullets on the 2nd and 3rd spot.
5 - Destroy both Sacrificial Bullets with Purge Bullet and give both bonuses to the Gravedigger's Bullet. Just by doing this, you deal 28 damage. Use both Dead Bullets
6 - Holster and don't parry.
7 - Set a Sacrificial Bullet on the 3rd spot and destroy it with the Kamikase Bullet. Again, grant the bonus to the Gravedigger's Bullet. If you have them, use the Dead Bullets again.
8 - Destroy the Gravedigger's Bullet with the other Kamikase Bullet for 146 damage.
9 - If possible, don't shoot the Vengance Bullet and repeat the process.

This strategy requires a bit of luck, but can deal a ton of damage if done correctly.