Sigyn locked Action Cards

Possible Spoilers!

There are the four locked Action Cards for Sigyn:

Synergy Connection: checking with Emil on how to use this card.

Recovery Algorithm: If you play this card on top of a damage card you gain 1 free rest action and block any effect from the damage card. You also can play the card normally.

Wakizashi Stabber: If you play this card on top of the Katana Slashers card, you can repeat it’s action one extra time against the same or different enemy.

Annihilator Drone: You can deal 7 unblockable damage spending 2 focus with this card PLUS extend it’s range to 5.