Andora is... an Exploration that can protect itself. Any of you know of the value of Exploration in places where it's legal?
Nisha is acceptable. A little off-colour if I want to make her a Zombie Tribal commander (since we can also have blue zombies available), but she works where she can fit in.
Green steals lands? That's a first I've heard of such a thing. Green also has land destruction - in fact a lot of its removal effects tend to hit anything but creatures. That said, Niflag Reclaimer looks okay on paper, but can be potentially rude when you exile a bounce-land with it (think Izzet Boilerworks and its ilk).
Curse Chanter is fine given its tight mana restrictions. The fact that you also lose the life can mean that the opponent is prone to exploiting it unless you're backed up with a good source of lifegain.
Extract Knowledge is too powerful. Compare Siphon Mind which gives equal amounts of draw for discard. Compare Pilfered Plans which is a milling equivalent. The tempo swing regarding cards in hand is too great for a mere 2 mana. Dial it up to 1UB or 2UB.
Relentless Research essentially eclipses Sign in Blood, being better than it in nearly every way. Instant speed, greater life loss which amounts to ending of games, and mad card draw which also can potentially end games. At 2 mana to boot. 5 cards for 2 mana, regardless of drawback, is too much efficiency. I would crank it up to BBRR at minimum if I want to keep this as an instant, 1BBR if it becomes a sorcery.
Unspoken Word is funny to say the least. While it has its niches, the fact that it's colorless and turns active very easily can make it go down the Mental Misstep slippery slope. It will result in players making awkward sequencing decisions when trying to dodge it or avoid going into an Unspoken counter war, and the result of this is overcentralization, like what happened with Misstep.
Try not to only design with the Modern mindset. Think about the applications of your cards in other eternal formats, like Commander or Vintage. Limited is only a concern if you're designing an entire set.
To the first part of you post yes i do know, this card was made cause I'm teaching some kids to play and i want them to know the value of fetiching in responese. Yet she is a creature and that makes her easy pickings for removal. explore is a enchanment and can by default if droped turn 1 not be stopped before you opponent got 2 mana open and that kind of removal on hand. She on the otherhand will get popped if you leave her without a fetch for just 1 round.
Yeah she might be off color for a zombie commander, she was meant to be a Orzhov Commander and we tryed her as a spirit commander it just made Lingering soul to strong...
The Reclaimer is mostly in the idea that Red is quite good at wrecking lands, splash green and they might not want to destroy it just take it back to nature, you will get the land back when she dies, I'm thinking about it as a tempo play agains combo and control. Yeah about the Izzet Boilerworks will he have to return another landd when he get it back then? cause landds always comes into play and is not considered a spell.
Yeah the Cures Chanter, the colors are strickt but its the colors that got the kinda life gain lose and burn to back it up, i was thinking it as a risky self inflicting deck with turn 3-4 win con's yet it was pointed out that with stuff like Damnation you can turn losing games into Draws but baming both of you, yet with somthing like Angel's Grace this can be nasty.
About the Extract Knowledge yeah i need to up the mana cost, yet i differes from the ones you pointed out, you yourself discard 2 cards to before the draw, you only gain tempo with no card in hand, its a hatefull reversed Faithless Looting.
Relentless Research i was thinking about making it 4 mana R/B dual mana all the way it was meant to be a late gas gen in somthing like hellbend decks 4 mana is fine then and the black red life lose theme fits it.
Mental Misstep yeah that path was in the back of my mind, the thing about the color is a flaw on my part i forgot about the pact rulings, it needs to specify its Black And Blue. just to clarify, yet it's like a storm stopper.
And about the last part, I play Moden and Commander. That means thats where i feel safe about what I'm doing but I'm starting to think more about stuff like Shield format that alows for slower games.
Regards Aztegio and thanks for feedback.