Pathaleon the Calculator

After my somewhat disappointing Satyr tribe, I’ve stopped creating new Custom Cards. However, lately I started to tinker again. When I was browsing the Wowhead database I remembered this particular instance boss. He has two abilities that I liked and I wanted to incorporate them in the game. Pathaleon the Calculator uses his Mana Tap ability to drain his opponent's mana and uses it to summons Nether Wraiths.

Hearthstone could really use some more Blood Eleves and a 4 CMC Legendary would be nice. So I came up with the following design: "At the End of Each turn, summon a 1/1 Nether Wraith for each unspent mana that turn." This basically forces your opponent to empty his mana pool. On turn 5 this minion is a 4/5 for 5 mana. Which isn't that strong. However, on turn 10 he will hit the board for 8/9 power/toughness. That it, if you play no other cards of course.

Personally I don't think it's the best card out there. But it is something a bit new and that's what I’m searching for. New abilities that we haven't seen until now in Hearthstone.
I hope you like the card. Leave comments below! :P