Cardboard Tube Samurai

Mercenary — Legendary — Human Warrior — Ardent

Set: Campaign: Chapter 2
Played in: The Campaign, in your party
How obtained: Kickstarter (the game's own note)

Default form (level 1)

Health: 24
Hand size: 8
Charges: 2

Party passive

At the start of the game, if you have four or more alternate art cards in your deck, there's a 50% chance you gain a charge.

Upgraded form (level 2)

Health: 24
Hand size: 8
Charges: 2

Samurai Strike - BASIC: Smack target champion with your trusty cardboard tube. 90% chance to deal 1 damage, 10% to deal 10 damage.
Path Through Oblivion - At the start of the game, create two Path Through Oblivion and put them into your deck.
Last Rites - At the start of your turn, there's a 20% chance to add a vulnerable counter to each opposing champion.

What upgrading changes

New
Last Rites - At the start of your turn, there's a 20% chance to add a vulnerable counter to each opposing champion.

Upgrade Your Mercenary: how it worked

Complete a Mercenary Challenge node in a dungeon to earn upgrade marks. Earn 2 marks and pay the mercenary’s fee to upgrade them permanently for your account.

Dungeon encounters can now be marked as a Mercenary Challenge. Defeating that encounter with a Mercenary will award bonus gold and grant progress towards upgrading that Mercenary.

The game's own words. The fee was set by the game's server, so its amount isn't in the game files. A mercenary could be upgraded once.

Party passive

At the start of the game, if you have four or more alternate art cards in your deck, there's a 50% chance you gain a charge.

Deck rules

Your deck must contain at least 10 alternate art or promo cards.

Shard Alignment

Number of each card you can add based on rarity and shard type
Shard	Common	Uncommon	Rare	Legendary
	4	4	4	4
	4	4	4	4
	4	4	4	4
	4	4	4	4
	4	4	4	4
Artifact	4	4	4	4