Some random cards!

[Golgari Thallid]

(1)(B)(B)
Slimy Horror
Creature-Ooze Horror
Rules Text-Fear
At the beginning of your upkeep, discard a card from your hand. If you cannot, sacrifice {Name}.
4/1
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(1)(B)
Slimefolk
Creature-Ooze
Rules Text-Swampwalk
Whenever {Name} deals damage to an opponent, that opponent discards a random nonland card, then sacrifces any cards with the same Converted Mana Cost as that card.
1/1
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(2)(B)(B)
Slimefolk Skulker
Creature-Ooze
Rules Text-Fear
At the beginning of your upkeep, pay 2 life or sacrifice {Name}.
Whenver Slimefolk Skulker deals damage to your opponent, that player discards a random nonland card, then you gain life equal to that cards Converted Mana Cost.

Yes, I realize Slimefolk Skulker is a bit White. Live with it.

More Slimefolk to come!

 

[Limited]

Slimefolk is too good. I like the tension of people having to get rid of cards in their hands that would destroy most of their permanents, but at only two mana? 2BB would be more appropriate (and the name should be changed to something that better reflects that it is a rare).

And what exactly do you mean by "discards a random nonland card"?
Your opponent "discards a card at random. If it is a nonland card ..." or your opponent "reveals cards from his or her hand at random, until a nonland card is revealed. That player discards that card and .."

And to clean up the wording a bit:
"At the beginning of your upkeep, discard a card from your hand. If you cannot, sacrifice {Name}." is usually written as "At the beginning of your upkeep, sacrifice {Name} unless you discard a card."

But, nice cards overal.

 

[Oversoul]

And what exactly do you mean by "discards a random nonland card"?
Your opponent "discards a card at random. If it is a nonland card ..." or your opponent "reveals cards from his or her hand at random, until a nonland card is revealed. That player discards that card and .."

I think he means that of the non-land cards in the opponent's hand, one of them is randomly chosen and discarded. This would have the slightly weird side-effect of letting you know how many lands are in your opponent's hand...

Tag Guard

 

[Limited]

So it could be replaced with "reveals cards from his or her hand at random, until a nonland card is revealed. That player discards that card and .."

That way, you don't see your opponents entire hand and you can't tell how many lands they are holding..