That’s not the point. For your plan to work, you’ll have to play all those cards in a single game. There is no way that such a cluttered deck would work. Let’s try running a basic simulation of how your deck will play out, and you will start to see problems immediately.
T1: You summon a Darkspine Elemental.
T1: Your opponent summons a Windstorm Obelysk and an Ethereal Obelysk.
T2: You summon Mirrorim on the mana tile, target Darkspine. You move Darkspine back two spaces and summon a second Darkspine on a nearby space. Your General moves forward two spaces and attacks the Ethereal Obelysk.
T2: The opponent’s Obelysks summon two Dervishes. One kills Mirrorim. Your opponent summons Duskweaver on a mana tile and give +2/+2 to the second Dervish. Your opponent summons a Fireblaze Obelysk. The Wind Dervish deals 5 damage to your General.
T3: You activate Shadow Nova. The Creeps kill Windstorm Obelysk and Ethereal Obelysk, and deal 4 damage to the enemy General.
T3: The opponent’s Obelysks summons 1 Dervishes. The buffed Wind dervish attacks your General. The second Dervish attacks your General. The enemy General moves away from the creep. Your opponent plays LitD, dealing 5 damage to your General. The enemy activates his BBS and summons a Iron Dervish.
T4: You summon Desolator and then cast your BBS on it. You attack the Iron Dervish.
T4: The enemy’s Obelysks summon 1 Dervish. The enemy General activates Acculumonimbus and kills you.
That’s the game. You’ve been hit by a 5 Attack Dervish two times, by 3 Attack Dervishes four times, and then took 5 damage by a LitD. That’s a game, and it all ended in 4 turns. It’s that easy. Meanwhile, you were only able to summon two Darkspine Elementals, create only 4 Shadow Creeps, deal only 4 damage to the enemy General, and only complete 1/6 of Xor’Xull’s Trial.