Goat format ruling
A Deal with Dark Ruler

Card effect (current official text)(This card is always treated as an "Archfiend" card.)
If a Level 8 or higher monster under your control was sent to the Graveyard this turn: Special Summon 1 "Berserk Dragon" from your hand or Deck.
Rulings
- The Lv in A Deal with Dark Ruler is the original Lv printed on the Monster Card.
- If your opponent's Lv 8 or higher monster than you control is sent to the GY, you can activate A Deal with Dark Ruler.
- You cannot activate A Deal with Dark Ruler during the Damage Step.
- You can only Special Summon 1 monster with A Deal with Dark Ruler, but you can activate 2 copies of A Deal with Dark Ruler to Special Summon 1 Berserk Dragon for each, even if only 1 Lv 8 or higher monster was sent to the GY.
- You can activate A Deal with Dark Ruler if your Lv 8 or higher monster that is an Equip Spell Card is sent from your side of the field to the GY (such as Koitsu or Dark Necrofear destroyed by Heavy Storm).
- If the summon of a Lv 8 or higher monster is negated, "A Deal with Dark Ruler" may not be activated for that monster.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Goat forum — sourced change requests get reviewed.