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A creature thats a copy of either has a converted mana cost of 0

This card is absurdly good, immediately replenishing your hand after you spent your early turns depleting it by vomiting out mana rocks, and then you have a free counterspell engine chucking those excess mana rocks at people's spells

How about the fact that you will often be able to attack with the aforementioned 4/4, immediately

In a multiplayer game, if an opponent leaves the game, all of the cards they own that you cloaked leave as well

The expensive and complicated mana cost makes this card a burden to have in your hand

What affects the value of The Darkness Crystal