I'm kind of still new here, in my opinion, but something I had an idea for the normal EtG was harps. The first I would like to present is Harp of Demise. Most cards have a positive and negative to having them on the field, and so I kept that theme from this one. Harp of Demise can cast plague every turn, but for every turn it (and its copies) stay on the field, you get poisoned. Now, poison is curable with Purify, yes, but if you're continuously poisoned, you wouldn't want to waste time with the poison on you. I do see the possible abuse with Shard of Sacrifice, but I think it would be a decent card nonetheless. Thoughts would be great!
