Good to see several Ide cards but not nearly enough Battle Maidens!!!
On to the cards
I Am Ready - I find it an odd card to have influence because of the restriction of only Unicorn characters. Other than that it adds some more untap effects although I'm not particularly sure it will come up that often. Some Unicorn decks or players will want to have a turn or two to 'save' up some characters for a big push and this does give them some room for a surprise second attack or defense.
Meishodo Wielder - A cost efficient character when you have the first player token but I feel the biggest problem is that lack of the cavalry trait. Even without it I suspect he'll see play just because of the 1 cost option that isn't terribly hard to obtain.
Moto Horde - Expensive use for 6 military that is definitely helped by another event in the preview. Honestly, the no attachments except weapons ability is more of a penalty than a benefit as I would have loved to give them a Tattooed Wanderer.
Moto Youth - I really like this guy for his cheap cost, that bushi and cavalry trait, and the buff during the first mil conflict. Even without the buff during the first mil conflict, he's versatile enough. About as staple of a card for the Unicorn as you can get.
Captive Audience - I'm sure a number of different clans will really love using this card and the ones that do won't necessarily care about the loss of 1 honor for that effect. Even with this card in you deck, I still wouldn't abandon political skill, and I would really think about using this or one of the other splashable clans (i.e. Dragon giving both the TW and Let Go).
Ide Messenger - I'll start by saying that this doesn't feel very Ide to me. I do like that she's cheap on the influence side but potentially costly for her and that ability. I actually wish her ability could either move a character you control to the conflict or back home.
Spyglass - Hmmmmm, dat Gaijin trait is nice. The card does reward you for the movement mechanic of the game but it really wants you to set up multiple triggers to really mitigate the fate and card cost. I almost wish it had no stat bonus but cost 0.
Ide Trader - This really could have had the cavalry trait but I do like how his ability helps to mitigate some of the fate/card costs of the other Unicorn cards. He even helps out with military conflicts if need be and supplies a needed courtier trait.
Shinjo Tatsuo - He's really an investment of your fate for a below stat character. However, that ability is pretty fantastic just for the ability to drag another character. He can even send himself and another bowed for the various conflict effects of the other Unicorn cards. FFG needs to go over the article and change that point that he has to spend a fate to use his ability. IF he did make you spend a fate to use his ability, I'd never use him.
Giver of Gifts - Meh really but he does gives more courtiers to the Unicorn. I really wish he could have also given the cavalry trait too. His ability can be useful but you're paying 3 fate for it and I'd rather use that fate on better characters or events.
Favored Mount - Giving cavalry is nice and the movement ability is worth using it alone.
Born in War - Expensive attachment but +4 or +5 military is huge and even better on some of the untap characters. Border Rider just gets better and better.
Cavalry Reserves - Oh geez. This card is just silly with some of the effective, cheap cavalry characters the Unicorn have access to. It does have a middling influence cost but there isn't enough cavalry for the other clans to abuse this yet.
Golden Plains Outpost - Good enough of an ability to warrant the 0 strength bonus to the province. Movement abilities are rather nice to have and getting it on the box is fantastic. It's limited for military conflicts only but you're likely to see two of those every turn anyways, if not three from Captive Audience.
Shinjo Al - Not the biggest fan of the ability but it's not terrible. The most likely result is killing a character that blocked the military attack. With I am Ready and Breakthrough, you could really do some damage to the other player.
The Unicorn look to be doing rather well, besides from the lack of Battle Maidens, and are in one of the better spots going forward. Going with 1 core set alone, I'd probably pick them with a splash of Dragon, Lion, or Crab. Probably just Dragon for the two cards of the TW and Let Go.