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The first {Howl of the Horde} will actually copy the second {Howl of the Horde} twice. You actually get 6 copies of the next spell you cast. So in total you will have 7 copies of the next spell you cast on the stack.

It's the same reason {control magic} is rendered useless on {karona, false god} by the time you get to the next upkeep.

Thank you for providing an actual proof that led to the discovery of the rules after some googling (I wasn't able to find the rules previously). I am indeed wrong about this combo.

I'm pretty sure you will gain control of {conjured currency} after you make the exchange. {Confiscate} and {volition reins} gives you control of the enchanted permanent as long as it is enchanted. Even if you made the exchange the game will check to see the owner of the aura thus giving you control again. Exchanging the enchanted permanent does not nullify the effects of the aura.

{Conjured Currency} + {volition reins} or {confiscate}

At the beginning of your upkeep exchange control of conjures currency and get it back while the auras are attached to it.

{Blood artist} + {Illness in the Ranks} +{Falkenrath Noble} + {Exquisite Blood}

Drop the krasis for 4x {Master Biomancer} and the 4 {growing ranks} for 4 {prophet of Kruphix}

The populate is nice but it's too slow to be effective in the current meta. I tried something similar. You're better off playing progenitor mimics and clones instead.

{necrotic sliver} can be used to force your opponent to concede.

{sliver legion} appears to be missing.

You could but you will usually win by the time you cast infinite reflection onto worldspine wurm. The moment you cast infinite reflection you can probably swung in for lethal.

Your opponent will then wait till you finish your combo and exile them with {angel of serenity} followed by an attack with {master of cruelties}

After looking at the ruling on worldspine wurm you are correct in that only the wurm is shuffled back into the library. Everything else will hit the graveyard.

{Basilica screechers}
{hands of binding}
{way of the thief}

I played a soft control/aggro/mill dimir deck for prerelease and stompped out all of the hyper aggro Boros/Gruul decks. I basically ran all cheap evasive creatures (unblockable/flying). Add tons of removal/cipher cards like {hands of binding} and {paranoid delusions}+{psychic strike}. Control the board long enough to drop {consuming aberration} and win.

Terminus puts everything back, you get to do it again later if you have multiple {infinite reflection}s or if you have something to shuffle your graveyard into library.

{worldspine wurm} + {infinite reflection}

Play this in a simic elf ramp deck to make the combo easier to pull off.

All your creatures become a copy of worldspine wurm, so when your opponent decides to clear the board you get 3 5/5 trample tokens for each creature you had on the field and all your creatures are shuffled back into your deck.

{Blightwidow}, {Tangle angler}, and {reaper of sheoldred} can end games quickly

Needs a {deadeye navigator}. Blink venser whenever your opponent casts something.