I'm on an Unhinged kick atm
If your opponent's tapped out, it's Exhaustion on steroids: you get to draw an extra card, untap all your lands, your opponent can't attack or cast a spell on their turn, and then you move into a new cycle. It's a very hard card to understand (and I don't claim to by any means) but it basically it ensures that anything sorcery-speed comes a turn behind schedule while cards with flash get even better (and cards that care about your upkeep - Ancestral Vision/Riftwing Cloudskate, Smokestack, Dark Confidant, Staggershock/Narset Transcendent - accelerate by a turn). You can bounce/destroy it to 'reset' the turn and Time Stop your opponent, and then do it again...
It's also 'hilarious' with The Tabernacle at Pendrell Vale...
What's that, BR has no answers to enchantments?! It's a fun thought exercise to break the symmetry here: I guess the mid-tier aggro creatures are more likely to be common/uncommon than mid-tier midrange cards, tokens get around it (though there are rare tokens right? see Marit Lage), and you can play a basic-heavy manabase. Most of the time, this card is a Death Cloud that's sometimes In Garruk's Wake + Mind Rot + Rain of Salt. See any Peasant Cube for inspiration.
EDIT: I read the card again, it's a lot worse than I thought! Still interesting though? Need a lot of X-spells