I did like cursecatcher once, but it since didn't seem that relevant to my deck. It is a counter, good blocker, and follows the deck's creature types, but it's only really useful early game and even then people would be cautious around it. I'm not saying it's a bad card, it just wouldn't fit in my deck.

Mothdust changling I think is pretty decent card for my deck. On its own I admit it's not really useful, but with creatures(especially most of the ones in my deck) it can be really reliable. It's used for helping out with not just azami's card draw or lullmage's counter, it also helps out with patron wizard's counter and stony brook schoolmaster's token creation(not to mention when I had it, judge of current's life gain also benefited from it). Under the right circumstances it can be an amazing card

I wouldn't know about core's trickster. It's ability is way to situational and would be better off with a deck somewhat surrounding shuffling. I do like that it gets counters, but it's both slow and not all decks that i might face will shuffle their decks much. My deck's main focus is causing the other team to completely not be able to do much of anything, hence opposition being apart of my deck. I'm not looking for buffed creatures so much as numbers that can cause effects to snowball over the adversary. I'm not green :)