Griffin

Ally unit 

This is an offensive card that lacks a lot of health. Its special ability makes the Griffin only good against wounded targets.

Ineffective as first striker.

Best used after Mage, Witch or Wyvern attack to deal the final blow.

It will last longer if you heal it frequently.

Combos 

With Gargoyle as first striker - than kill the enemy unit with the Griffin.

With Beholder to reflect some damage back.

The blessing ability of the Warlord or even the Acolyte turns the Griffin into a killing machine.

Tournament - all cards begin the battle with 2/3 health

Always use the Griffin in this case and most of the time you will have a sure kill if you target the rear row units. If you use the Ghoul in that Tournament, target the unit in front of him, so the Ghoul can heal after the kill.

Enemy unit 

If you have the Warlock always target the Griffin first.

Try to heal every unit to full health.