Scour the Laboratory

Text:

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

Rulings:

• 7/13/2016 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 <img src="/Handlers/Image.ashx?size=small&amp;name=4&amp;type=symbol" alt="4" align="absbottom" /><img src="/Handlers/Image.ashx?size=small&amp;name=U&amp;type=symbol" alt="Blue" align="absbottom" /><img src="/Handlers/Image.ashx?size=small&amp;name=U&amp;type=symbol" alt="Blue" align="absbottom" /> to cast.