Idea of this deck is constantly point direct damage to the opponents face. Allow your health to get low, but not to the point where you will die. It's okay to aim damage spells to the opponents creatures if necessary.
Then when the coast is clear cast Madcap to get the mirror to refill your hand. The cost is really high. You end up shuffling everything into your deck and basically just getting your hand. But there is a plan. You only want to do this when you can produce 5 Mana without using your land drop. This way you can play the land and cast Madcap OR cast Madcap and then play the land. That gives you 2 Mana. Your rituals can ramp you up to 3 or even 4 Mana to deploy all your newly drawn burn spells.
Atarka's Command has a hidden mode that this deck actually uses. The putting a land onto the battlefield mode. This deck uses that very well. Eot burn for 3 and then bolt them. If you don't have actual bolt then cast it main phase to be able to cast bump, skewer, spike, etc.
The trigger for the Mirror goes off when it enters the battlefield. This means there is no point where the opponent can destroy it in response if you took lethal off the Madcap.
You can and do sometimes play a Mirror before going off. This is especially interesting if you manage to Madcap the other one. You get 2 triggers and can respond in-between them. So any rituals you draw will only add Mana to the pool for the second hand.
This is mostly made to be a fun deck but can actually put up some numbers.
I've had a few games where the opponent cast StoneForge getting Batterskull. I cast Atarka's Command eot and then bolted the Mystic to get ramp and basically free damage.
The deck can be tweaked in different metas, but large cheap creatures are hard to deal with.
If you expect lots of affinity or cookbooks then you can main Destructive Revelry and side in Smash to Smithereens. The Revelry almost made it main deck since there are lots of targets one way or the other. Only issue is Monkey and other fast decks do not tend to have lots of targets. Meta dependent.