Scour the Laboratory — ruling 1

If an effect allows you to cast Scour the Laboratory from your graveyard, count the number of card types among cards in your graveyard after moving Scour the Laboratory from your graveyard to the stack. If its delirium effect no longer applies, it costs {4}{U}{U} to cast.

Scour the Laboratory : règles, fonctionnement et interactions (MTG)

Scour the Laboratory is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Delirium — This spell costs less to cast if there are four or more card types among cards in your graveyard. Draw three cards.

How it works : Scour the Laboratory

Original English text — Wizards of the Coast / Scryfall

#1July 13, 2016· Wizards of the Coast
If an effect allows you to cast Scour the Laboratory from your graveyard, count the number of card types among cards in your graveyard after moving Scour the Laboratory from your graveyard to the stack. If its delirium effect no longer applies, it costs to cast.
No other card is named in this ruling.