Hólmganga

Discard one of your units with upgrades attached. Relocate all the upgrades to one of your other units. Discard this action card after.

Discard a unit card from your hand. Draw 5 cards, choose 2 cards to put in your hand, and put the rest back in your deck. Shuffle your deck. Discard this action card after.

A holmgang was a legally recognized duel used to settle disputes or acquire possessions. However, these duels were eventually outlawed.