User blog comment:BlitzerRyuusei/The Most Important Starter Deck Cards/@comment-23890757-20150126204942/@comment-25701166-20150126234905

That's not how this work. Grave night isn't Iona only, and that makes even non Iona players want to splash it. Black crisis however, is a useless card for non Iona/Mayu/Ulith 5 player