Ink-Treader: Lamentation of the Intrepid - Weird name for a creature, but interesting take on a hate bear. Would need a very specific environment to do something, since if you're not playing an opponent who's ramping or fetching, it's basically just a worse
Deadly Reculuse.
Raptorchan: Mirror Twin - Not sure why you went with Reflection, which has only ever been used on one weird card, instead of Illusion, but I guess it does feed into the flavor a little better (even if the mechanics of the card are those of a shapeshifter). The card itself is similar to
Mirror Match and
Mirror Mockery, probably deliberately. Another card that, funnily enough, will often play like a double-pipped
Deadly Recluse without reach.
Krishnath: Yithian Phantasm - Huh. I think you might have a slight misunderstanding of what "keyword abilities" are, and players definitely would too. Here's a random set of five items from the middle of the list of keyword abilities (found in Rule 702): Amplify, Provoke, Storm, Affinity, Entwine. So unless you list out the abilities this would get (see:
Cairn Wanderer), people are not going to know what this card does, especially since I don't believe the text limits this to having these abilities on the battlefield. Also not sure what the deal with the third ability is, since, other than
Morphling et al., Shapeshifters and Nightmares aren't particularly known for having activated abilities.
bravelion83: Enigmatic Mirage - Fun
Spellskite variant, weird execution. I'm particularly confused by the hexproof activation, which, as far as I can tell, would matter only in the very rare case that you want to preemptively protect it from sorcery-speed removal during your opponent's upkeep. Otherwise, the creature would already have been sacrificed by the time the spell would resolve, so the spell would be fizzled anyway. Is there something I'm missing?
barbecube: Hollow Apparition - Similar flavor to bravelion's card, but this one makes a bit more sense to me. Admittedly, it's very very strong, and might lead to some unfun play patterns since people just wouldn't use their targeted removal for fear of the onboard 2-for-1, but it does have a coherent flavor and function.
Gateways7: Soul of Amonkhet - I'm a big fan of the Soul cycle®, as you can probably tell from my own submission this round, and in fact I strongly considered submitting a BR version of the Soul of Amonkhet but had trouble getting it far enough from
Soul of Innistrad. You successfully did that by giving it cycling and eternalize, but it was at the expense of violating the very clear rules of the cycle: two activated abilities with the same effect for the same cost, except one of the abilities exiles the Soul itself from the graveyard. There likely was a cool way to do a Soul of Amonkhet, and I'm sure there was a way to flavor this card that would make it work, but I'm afraid that in trying to split the difference you didn't quite get there.
1. Raptorchan
2. Ink-Treader
3. barbecube