I've play tested several waste not builds with proxies and the only problem with black cat is that it's easily avoided. It would be better if you could ping it for little or no mana. I am now using Feast because of the very reason thug said.
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Rightly so! I love your feedback, though thank you very much. I'll let you know how the next round of playtests go.
The only problem I have with UC is that after proxy testing early builds the extra self damage started to really stack against me. I did take out Shrivan Reef for this reason and left Mana Confluence in there but I'm hesitant to use anything else that gives me self damage. I'll consider those if the next play test proves I need more draw. I think with Whispering madness and Siren though, I should be able to produce card draw reliably. I took Hero's out for the dreadbore because I was really overloaded on 3 drops. The only downfall there is that it's not instant speed, but again I'll have to consider the two options after further playtesting.
Thanks for the advice. I'm taking green out completely and I've made the lilly change and added whispering madness in as well as dreadbore for hero's to cutdown on the 3 drop.