Tengu format ruling
Dora of Fate

Card effect (current official text)You can only activate this card during your opponent's turn. Select 1 face-up monster on your opponent's side of the field. When you Normal Summon a monster that is 1 Level lower than the selected monster during your next turn, inflict damage to your opponent's Life Points equal to the Level of the selected monster x 500 points.
Rulings
- Dora of Fate's effect only applies when you Summon a monster, not when your opponent Summons a monster.
- Dora of Fate targets: the face-up monster on your opponent's side of the field.
- If you Summon multiple times with Ultimate Offering, Dora of Fate only applies to the first Summon.
- You cannot use Barrel Behind the Door against Dora of Fate.
- You get the Dora of Fate's effect even if the monster you selected (on your opponent's side of the field) is destroyed before you Summon.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Tengu forum — sourced change requests get reviewed.