MArcomage

I think the picture is already in use by a card that is uncommon and reduces enemy tower by 50 if enemy tower>60 else enemy tower -10? I don't remember the name

EDIT:
Oh no, sorry. It's Jealousy and it's a different picture.

This is a nice idea

Jaj for more Illusion rares!

But...
Don't you mean:
Select a card from enemy hand to be replaced with a card with same rarity not from enemy deck.

I think it would suit the Illusion keyword better. It might even be fun to let it be from your deck instead of his.