This combo is just about getting HA Garunix on field and using its effect to summon monsters from deck that can revive HA Garunix to use the effect again (it is not once per turn!). NB1: If HA Garunix is not destroyed by battle after being revived by Arvata, then it will be destroyed by card effect and will nuke the field on the next Standy Phase. This might matter when choosing to summon Arvata or Kirin first. NB2: If Sacred Garunix is not already in rotation, then summon it at step 1. to then destroy Arvata or Kirin to revive HA Garunix.