Loyalty means nothing but use as a skull shield. Should be able to take 4-5 skulls so it serves its purpose. The key in using loyalty is that every time you cast it increases armor on all troops. Because of this and Gard’s same ability for himself, Gard gets 7 armor every time you cast a spell. Here is how I play.
Fill Alchemist as quick as possible. Cast Alchemist to fill Hellcat. with a few back and forth you have just increased Gard’s armor up and filled him with mana. When Hellcat or Alchemist is filled, cast gard. Do it again, and you win on the second Gard cast. Matches are very fast and very reliable. Because you aren’t getting green mana unless it drops, Psion doesn’t steal mana. Leave all skull matches for them to burn their turn.
Because you need a few loops to get it to work, playing this on PC with 4X is best. Either way, I have never lost a battle with this team, not once.