Thanks for your feedback! Some replies:
Xof: I feel like he should be an living illusion(rather than a "sees the future" type creature; otherwise he would protect himself when he knows an attack is coming rather than gaining attack. knowing you arent getting attacked should make you ), who gets more powerful the more attention you give him. Based on that, I would make him a mind spell, and gain the illusion subtype(but meh, you can throw that out).
Card text could be cleaned up a bit, so i did that. I altered his function slightly to make wording easier. Yes, I hurt him by making him invisible, so you cant give him enchantments or such, but invisible is an easy to understand condition. Note that he doesn't lose invisible by attacking unlike [mwcard=FWC08]Invisible Stalker[/mwcard]. Yes, Vigilant may have some unintended effects, and it can give him 2 counterattacks a turn.
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Xof
Has Invisible Trait, Vigilant trait, and a 4 dice melee attack.
Xof has melee-2 while invisible. During the upkeep phase, an opponent may give him a visible marker.
"I've heard of animals feeding on attention, but this is something else..."
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That does make the text considerably more concise, and accomplishes more or less the same effect. But as you say, there may be some unintended consequences if cards that interact with the Invisible trait come out (vigilant is fine; it makes a lot of sense for this creature). Thematically, it is not invisible, just prescient of coming danger, so I don't know if I want to give it the invisible trait (for similar reasons, one should be hesitant to call on teleport when doing something that is definitely not a teleport, which is why my Tentacle of the Kraken is worded the way it is).
The reason he gains melee when an attack is coming isn't so much a thematic concern (although you can certainly justify it with the Xof becoming aggressive), but rather to stop the opponent from simply placing a Warning marker every turn, which would defeat the point of the card. Since warning the Xof makes it stronger, your opponent is only likely to do it right before an attack.
Also note that the Xof is currently only warned against attacks, whereas Invisible would warn it against everything.
As far as being a living illusion - well, that is theme. I personally prefer to reserve illusion status for creatures like the Illusory Tormentor, where the unreality of it is reflected in its attacks as well as its intangibility.
Voltaric rift: make it block line of sight? it seems all sight-blocky from the picture, but that would require making it cost more than wall of fog...
I considered blocking LOS, but as you say, it would increase the cost. Think of it as a rift on the ground, that you can step across or into. If it's too expensive, it won't be used, so I can't really allow much overlap with fog bank.
Voltaric beacon: I worry that someone could spam Voltaric Beacons to make a telepit strategy impossible. Or they could use it to retreat back across the board too easily.
Seems to me that Voltaric beacon should destroy itself at the end of the round like Brace Yourself. I assume it means "when subject to a teleport effect" so that this enchantment can prevent a [mwcard=MW1I01]Banish[/mwcard]. seems too strong if a facedown enchantment across the board can block a banish. Here comes another rewording from me:
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Voltaric Beacon
Unique, Arcane 1
2 mana to cast. 2 mana to reveal.
The following applies to any friendly creature within 2 zones: Counter any teleport spell or effect which targets or teleports this creature. If a spell or effect is countered this way, teleport this creature to Voltaric Beacon's zone. Destroy Voltaric beacon at the end of the round.
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But I would make it work similarly to [mwcard=MWSTX2FFJ06]Rolling Fog[/mwcard] in how it functions.
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Voltaric Beacon 2
Epic, Arcane 2 Conjuration
7 mana. Incorporeal, Indestructible, Dissipate 3
teleport subtype.
Counter every other teleport spell and effect in the arena. Any creature targeted by a teleport spell or effect is teleported to this zone unless its controller pays 2 mana.
The primary reason I created Voltaric Beacon was to counter telepit strategies. The problem is, simply making an object immune to teleport is only useful if your opponent uses teleport, so the card is wasted otherwise, hence the dual use (to retreat, as you say). I think your point about it destroying itself is a good one; I may just add that in. I prefer not to go the Epic route, since as a counter or escape spell it works best as a surprise. I don't think it should have a maximum range, though.
Magisbane Lily: I am concerned that the Magisbane lily is too awesome. Seems to me that it should be similarly priced(in mana and spellpoints) to [mwcard=DNJ02]Corrosive Orchid[/mwcard] since it has a similar effect.
Well, in general the consensus seems to be that equipment is stronger than enchantments; it is harder to remove and is not subject to mass removal. The Magisbane Lily will allow you to remove 1 enchantment (and only once), whereas the Corrosive Orchid removes 1 piece of equipment, so if you accept that equipment is more valuable, I think the lower cost (in mana and level) is justified. Note also, that its attack is less useful; the Orchid can potentially strip away armor, whereas the lily just has the chance to drain mana.
The reason I created it was to give the Warlord a more reasonably priced dispel option (also, I love conjurations with attacks). The only potential problem might be the level (6 cheap conjurations with attacks could be quite powerful), but as it stands I am not terribly worried. If you test it and find otherwise, let me know.
Regarding card counts, my main concern was to fill the sheets evenly so as not to waste space. I considered putting 2 Lazy apprentices, but it would have necessitated another sheet. I might need to review how many of each I put in, but I am more concerned about how the cards play than the distribution.
If you print these out and try them (any of them), I would love to hear a battle report. Unfortunately, I have been too busy lately to do much design, so it may be a while before I update these.