MTG Salvation

How is wither "garbage?" It's quite powerful.
A creature dealer any damage by a source with faze uses its power rather than toughness that turn to determine lethal damage. This applies to all damage dealt to us, not damage dealt just by sources with faze. I haven't yet found the best wording for the effect, as is evidenced by your confusion.

I don't have any friends nearby who are even vaguely interested in custom cards, so any kind of physical playtesting is nigh impossible for me.

Quixotic Familiar 1U
Creature — Weird
Flash
1U, Return Quixotic Familiar and another creature you own to your hand: Draw a card.
2/1

Next: Horde of Notions

I have no mind for designing for limited in any way, or designing a cohesive set, for that matter. I especially can't bring myself to care much for draft archetypes. I just like building interesting individual cards.

I don't think anyone really believes their idea was "stolen." It's just amusing to note that a card you had designed (or something very close) actually got printed.

Twisted Crags
Land
Twisted Crags enters the battlefield tapped.
t: Add R to your mana pool.
t, Discard two cards: Draw a card.

Scroll of the Void 2
Artifact
1, t: Any number of target permanents you control lose all card types and subtypes until end of turn.

Next: Ephara, God of the Polis

I'd just like to point out that due to the static effect turning all of your creatures into Slivers, neither of the triggered abilities on this card work.

Stone of Worth 3
Artifact
T: Add C to your mana pool.
2, T: Counter target triggered ability you control.

If you want to avoid players using this for mana the turn it comes out, it has to be a static effect rather than a triggered ability. Otherwise, you can cast an instant spell in response and use it anyway.
"You can't cast spells if ~ entered the battlefield this turn," maybe?

Actually I just looked at Through Criminal's post. That seems like the best option.

Meaningless Search U
Instant
Scry 1.
Retrace (You may cast this card from your graveyard by discarding a land card in addition to its other costs.)
If you discarded a Swamp card to cast Meaningless Search, each opponent loses 1 life.

This design doesn't work as you currently have it. You can't grant flash through the mana ability spent to cast a spell, because you don't start paying costs of a spell with mana abilities until after all the other decisions about the spell have been made. The first step in casting a spell is announcing it and putting it on the stack, and if you're casting a spell that can normally only be cast at sorcery speed, this land isn't going to speed it up until much later in the process.
I do really like the idea of the land granting suspend to your spells as a drawback, though. That's a neat idea.

Ember Stone 2UR
Artifact
Creatures your opponents control get -1/-0.
Damage dealt by sources you control is dealt as though its source has faze. (Use power rather than toughness to determine lethal damage to creatures marked with faze damage.)

There's far too much going on with this card. I would cut the token-producing death trigger, since it has nothing to do with any of the other abilities. I would also cut the last ability — it's going to be difficult to execute properly, since when you cast a spell for its bestow cost, it ceases being a creature and thus loses all creature types.
Perhaps the following would make for better text:

"Bestow 2GUB
You control enchanted creature. It's a Sliver in addition to its other types."

I would end the text right there, because it's already wordy. However, here's my attempt to fix the rest:

"Sliver cards in you hand have bestow xGB, where X is their mana cost. Whenever you cast a card this way, it gains 'You control enchanted creature. It's a Sliver in addition to its other types."

It's quite a messy ability to try to implement, though I do think it's a cool idea. Perhaps someone else can come up with better wording.

Molten Lens 3
Artifact
R, Discard a card: Exile the top two cards of your library. You may play one of those cards this turn.

IIRC the "official" order is unchanged. I believe it was made clear that the wedge order used in the Tarkir block was an exception.

This follows in the vein of Slivers having names and abilities that reference older cards. I like that.
My comment was going to be that this could easily fit in mono-white, and that it could probably be 1 cheaper. Then I noticed that it can "steal" your opponent's equipment. That definitely upgrades it in power. I think the colors and the cost are good where they are.
Here's how I believe the card should be formatted. Note that subtypes are capitalized, and that you've got the mana in the wrong order. Small errors, but still things to consider.

Sliver Squire 2WU
Creature — Sliver
All Slivers you control have "T: Attach target Equipment to target creature you control."
2/2


My card:

Peculiar Recovery 1G
Sorcery
Choose one —
• Return target creature card from your graveyard to your hand.
• You may put a creature card with converted mana cost 3 or less from your hand onto the battlefield.
Entwine W (Choose both if you pay the entwine cost.)

I would like to point out that there's no existing card that triggers the transform ability on Inquisition Saber, and that your planeswalker design doesn't trigger it either. All of the flip-walkers exile themselves and return to the battlefield transformed, rather than transforming directly.