I'm often use this combo in my Gladiator Harpie Deck
Cards you need:
Random Gladiator Beast Monster or Gladiator beast Octavius
+
Swallow's Nest
Description
I attack with Bestiary and get out Octavius. Now we have the choice to wait or activate Swallow's Nest to get out Dark Simorgh. I like to wait 1 turn if I have advantage. If Octavius is still on the field then we attack with Octavius and use Swallow's Nest before his negative effect activate and and summon Dark Simorgh
Cards you need:
Random Gladiator Beast Monster or Gladiator beast Octavius
+
Swallow's Nest
Description
I attack with Bestiary and get out Octavius. Now we have the choice to wait or activate Swallow's Nest to get out Dark Simorgh. I like to wait 1 turn if I have advantage. If Octavius is still on the field then we attack with Octavius and use Swallow's Nest before his negative effect activate and and summon Dark Simorgh