Raviel, Lord of Phantasms - Shimmering Scraper — Ruling

Effetto 0

The text that states this card cannot be Normal Summoned/Set and must be Special Summoned by Tributing 3 monsters is not an effect. (Tributing 3 monsters in your Monster Zone is part of the Special Summoning procedure. Tributing monsters and Special Summoning this card do not happen simultaneously.)
This card must be Special Summoned from your hand by the procedure written in its text. Even if this card is sent to the Graveyard after it was Special Summoned before, it cannot be Special Summoned by effects such as Monster Reborn.

About this card's ① st effect:
This effect is a Quick Effect, which can be activated in the Hand.
This card's effect that doubles the ATK of a Raviel, Lord of Phantasms on your field and allows it to attack all monsters on your opponent's field is a Quick Effect that activates in the hand. (It targets 1 face-up Raviel, Lord of Phantasms in your Monster Zone. It can be activated optionally during either player's turn, and if activated during the Damage Step, it can only be activated at the start of the Damage Step or before damage calculation. Discarding this card from your hand is the cost to activate this effect.)

About this card's ② nd effect:
This effect is an Ignition Effect, which can be activated in the Graveyard.
This card's effect that adds it to your hand is an Ignition Effect that activates in the Graveyard. (It does not target. Tributing a monster in your Monster Zone is the cost to activate this effect.)