Solomon Grundy/Boss

Boss Solomon Grundy can be unlocked during his challenge. He can also be obtained from either the Challenge Booster Pack, or from the Most Wanted Pack, but this will not unlock him for direct promotions.

Strategy
Solomon Grundy Boss is a unique card that deals exponentially more damage as his health depletes. Boss Grundy is able to inflict 10x damage with basic attacks at very low health.

He has a few very noticeable drawbacks: as a Solomon Grundy character, his attack speed, particularly that of his heavy attack (which also has a painfully long recovery time), is notoriously slow and his heavy combos are extremely easily interrupted by specials and basic attacks alike. Also, he has the lowest base damage stat among all gold cards, meaning his 10x damage is much less impressive than it sounds, especially since additional sources of bonus damage (such as basic/crit gear) scale according to his base damage, and he can get knocked out very easily trying to do any serious damage with his passive. For these reasons, he is almost non-existent in multiplayer.

If you do want to use him however, his specific gear is a good fit for him, adding more damage to his basic attacks, giving him unblockable chance on basic attacks, excellent for such a basic-reliant character, and a self-heal on special 1, allowing him to have one foot in the grave significantly longer. Gauntlets of Azrael is also good for him, as its gives a high chance to heal the amount of damage dealt in a combo ender, which increases as his health decreases, acting as a counterbalance to his passive, while giving a large max health increase. With enough basic damage/crit gear, a combo ender at 10x damage could heal more than a heal on s1. Block gear can be useful to prevent him from going down when he is already at low health.

Abilities
Here are Solomon Grundy's abilities.

Support Cards and Gear
Here are Solomon Grundy's support cards and gear.

Trivia

 * At release, it is possible to heal from low health and still retain the high damage boost. This was later patched.