Scour the Laboratory
Buy
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Delirium — This spell costs 
less to cast if there are four or more card types among cards in your graveyard.
Draw three cards.
Illustrated by Greg Opalinski
Rulings (1)
Jul 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 
to cast.
