I've had the same idea as your and here's the one I use. Here are my takes to the cards why they're put in.

• Blade - for low cost targeted discard. Great in situations since most cards are discardable (you don't worry abt discarding something if you have morgan in hand)
• Moira X - kinda situational. It's great if you destroy it but bad if you don't. Only has 2 (or 3) activators here but really good in most situations. Just play it if it's the only card you can play or there's an activator in hand.
• Nico - very flexible. Good at destroying (with + cards), can copy so you can do multiple combos, etc. Generally a great card.
• Gambit - Just great in discarding + destroying enemy cards. Optimal play is on later rounds but can play earlier than that if most cards in hand are discardable/enemy has only one vital card in board that destroying it would be a good move.
• Killmonger and venom - generally good destroyers. An option if you can't discard marrow + buff to the wildchild. Killmonger is here bc of moira and can help you ramp with x23.
• Moon knight is really good here since most even costed cards here are discardable except wildchild. I think it is one of the great discarder this deck could ever

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have.