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It forces your opponent into a game of "block and lose their creature or let you cast a spell in their graveyard." Since it's a one-drop, you can get it down on the battlefield at any point, and potentially start taking advantage of it as soon as the second turn begins

We have a spoiler

Part of a very annoying and winning deck when it was in Standard with Restoration Angel

You really want that powerful cast trigger, but 9 is difficult

People also have their eyes on Ketramose for 60-card formats including Modern

By focusing on attacking, we are rewarded with powerful attack triggers (Utvara Hellkite) and combat triggers (Yuriko, the Tiger's Shadow)