You won't be needing those. I have something better.
This page refers to the compound card from Act II. For the beast card from Act I, see Amalgam.
The Amalgam is a compound card created at the beginning of the second phase of Leshy's bossfight in Act II. The default cards used to create Leshy's amalgam are Cat (cost), Skeleton (stats; power & health) and Squirrel (sigils). During the first phase of Leshy's fight, the properties of the players cards will be recorded as they perish, replacing the default cards. The first dead card has its cost recorded, the second its stats, and the third its sigils. At the beginning of his second phase, Leshy will replace the player's entire hand with Amalgam cards bearing those recorded properties.
Amalgams cannot be taken as permanent additions to the player's deck, and do not appear in the Collected Cards catalogue.
Strategy[]
Amalgams can be made immensely powerful by killing off cards in strategic order during the first phase of the fight. If the first card to die is low-cost or free, the Amalgams will be much easier to play in the second phase. From there, the next two cards having good stats and good sigils respectively will result in an immensely powerful starting hand to finish off the fight.