Edison format ruling
Ritual Foregone

Card effect (current official text)Pay 1000 LP; Special Summon 1 Ritual Monster from your hand, but it cannot attack, also destroy it during the End Phase. You can only activate 1 "Ritual Foregone" per turn.
Rulings
- If the Ritual Monster Special Summoned by "Ritual Foregone" is flipped face-down or is removed from play (even temporarily), the effects of "Ritual Foregone" are not applied. So the monster can attack this turn, and is not destroyed at the end of this turn.
- Even if "Non-Spellcasting Area" is active, a Ritual Monster that is not an Effect Monster (such as "Hungry Burger") will still be affected by the restrictions on "Ritual Foregone". So it still cannot attack and it is still destroyed at the end of this turn.
- Even though only 1 copy of this card can be activated each turn, you can chain "Serial Spell" to it to duplicate the effect.
- If "Destiny Hero – Diamond Dude" uses its effect and reveals "Ritual Foregone", you can still activate another "Ritual Foregone" that same turn.
Rulings data courtesy of Format Library — formatlibrary.com. Spotted an inaccuracy? Flag it in the Edison forum — sourced change requests get reviewed.