First, set "Gleipnir, the Fetters of Fenrir" and a monster, then when the monster is about to be destroyed by battle, activate "Gleipnir, the Fetters of Fenrir" to add "Tanngnjostr of the Nordic Beasts" to your hand.

When the monster is destroyed by battle, activate the effect of "Tanngnjostr of the Nordic Beasts" from your hand, and Special Summon it in Defense Position!

During your own turn, change "Tanngnjostr of the Nordic Beasts" into Attack Position and use its effect to Special Summon "Guldfaxe of the Nordic Beasts"!

Now, use the two monsters to Synchro Summon a Level 7 monster, or Normal Summon a Level 3 monster to Synchro Summon "Thor, Lord of the Aesir"!