$30 Discard

Mana base Is garbage. You need more mana, Also If you look at the mana curve on your side of the screen its pretty messed up having too much rrequired mana and barely any lands

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For a $30 Budget Deck, using cards such as Liliana Vess and Sword of Body and Mind might not only be expensive, but to a large extent they alone may cost more than $30 and they are not too useful for Discard. I also agree with the above post about the lack of mana. With a mono-colored deck, you might want to think about 20 Swamps and cutting the amount of highcost cards. The cards that are not mana heavy seem to lack the ability to drive the deck, and some of the cards that are mana heavy don't really mean much in terms of gameplay.

If you're thinking of making a Discard Deck, you want to try and focus entirely on creating a deck in which the cards flow and achieve victory revolving around maintaining your opponents hand. Cards such as Duress, Mind Rot, Sign in Blood, and Liliana Vess aid this goal. Yet, it seems like most of the other cards do not. The zero cost artifacts may appear useful for defense/offense, but they're not something you'd want to waste time drawing for an initial hand or in the midst of a game. A lot of the other creatures and artifacts are either too high-cost, or they're not in sync with the deck type. For instance, Geth sounds like a great card; but does a discard deck really support it? You'd have to wait for seven mana, play the card, wait a turn, and then spend your next turn using his ability. Essentially at that point, you're giving your opponent too much time to execute their own plan. Other cards such as Diabolic Tutor and Mind Sludge may seem useful, but Diabolic Tutor is typically too expensive to run 4 of, and Mind Sludge isn't very effective. By the time you have enough mana to play Mind Sludge, hopefully in a discard deck you've already gotten your opponent down to less than 3 cards.

Rather than discussing the reasons behind why I'd suggest replacing certain cards, it might be best for me to simply suggest a few cards that may enhance a discard deck.

Liliana's Specter is a great 3 cost flying creature that forces all opponents to discard a card when it comes into play. This not only provides offense/defense, but also will have a guarenteed effect upon play. Guul Drax Specter is another flying creature that costs 4, making it an ideal replacement for some of your large creatures. Whenever your opponent has an empty hand, it goes from a 2/2 to a 5/5 and whenever it deals damage your opponent discards a card. Bloodhusk Ritualist is a 3 drop that is not flying, however, each time you kick it for 1 mana your opponent must discard a card. Aside from creatures that discard cards, Gatekeeper of Malikir is a low cost creature that forces your opponent to sacrifice a creature, thus allowing you to clear the field.

Duress, Inquisition of Kozilek, and Horrifying Revelation are all great spells that cause your opponent to discard a card in different ways, and each is only a 1 drop. These are great for crippling your opponent's ability to play cards early in the game, as most of them allow you to view their hand and choose the proper card. Quest for Nihil Stone is another useful enchantment that essentially deals 5 damage to your opponent at the beginning of their upkeep if they have no hand, which flows well with many of the stated creatures. Finally, any kill spells such as Grasp of Darkness, Doomblade, Go for the Throat, and Quag Sickness are useful in maintaining the field in addition to manipulating their hand.

Anyhow, it seems lengthy, but these are just suggestions for cards that are typically associated with the term 'discard'. Maybe some of the suggested cards may have an appeal, but regardless, I think the best thing for you to do is research Discard Decks in order to find cards that aid the process.