Jormungardr the Nordic Serpent

"This card cannot be Normal Summoned. You can Special Summon this card (from your hand) to your opponent's field in Defense Position if there is a 'Nordic' monster on the field" is not treated as a monster effect. (This is a condition to Special Summon a Special Summon Monster. A Chain Link is not built when Special Summoning in this way.)

If "Jormungandr the Nordic Serpent" was successfully Special Summoned from the hand by the method written in its text and is subsequently sent to the Graveyard, it can be Special Summoned from the Graveyard by the effect of "Monster Reborn" or similar cards.

The effect "If there is no 'Aesir' monster on the field, destroy this card" is a Continuous Effect. (This is also applied during the Damage Step.)

The effect "②: Once while this card is face-up on the field, if this face-up Defense Position card is changed to face-up Attack Position: Inflict 3000 damage to yourself" is a Trigger Effect. (This effect does not target. It is a mandatory effect that activates if a face-up Defense Position "Jormungandr the Nordic Serpent" is changed to face-up Attack Position. The player who controls "Jormungandr the Nordic Serpent" activates the effect, and the player who activated that effect takes the damage.)