There are no instructions provided, so it’s unclear how this is supposed to be pulled off. Get a one-mana Mecha’thun with Sonya Shadowdancer? No indication of how to kill your first Mecha’thun; if you leave it on the board with Sonya for a turn, your opponent will kill Sonya before Mecha’thun, and you don’t get your one-mana copy. If you do get a one-mana Mecha’thun, you could Backstab it, but you have to empty your hand of EVERY other card first, and since by that time you’ve played Valeera the Hollow you will have a Shadow Reflection to get rid of. What if your deck is empty, and you have 2 cards in your hand, one-mana Mecha’thun and Backstab (which has to be the happiest possible way this could end), but there are no other minions on the board? Play Mecha’thun and Backstab it, you still have a Backstab reflection in your hand = you lose. Play two Mecha’thuns and Backstab one = you lose. Necrium Blade is useless for Mecha’thun, because if you trigger its deathrattle but Mecha’thun itself is still on the board, your battlefield is not empty! If this deck can work at all, it won’t be reliably.
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There are no instructions provided, so it’s unclear how this is supposed to be pulled off. Get a one-mana Mecha’thun with Sonya Shadowdancer? No indication of how to kill your first Mecha’thun; if you leave it on the board with Sonya for a turn, your opponent will kill Sonya before Mecha’thun, and you don’t get your one-mana copy. If you do get a one-mana Mecha’thun, you could Backstab it, but you have to empty your hand of EVERY other card first, and since by that time you’ve played Valeera the Hollow you will have a Shadow Reflection to get rid of. What if your deck is empty, and you have 2 cards in your hand, one-mana Mecha’thun and Backstab (which has to be the happiest possible way this could end), but there are no other minions on the board? Play Mecha’thun and Backstab it, you still have a Backstab reflection in your hand = you lose. Play two Mecha’thuns and Backstab one = you lose. Necrium Blade is useless for Mecha’thun, because if you trigger its deathrattle but Mecha’thun itself is still on the board, your battlefield is not empty! If this deck can work at all, it won’t be reliably.