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Gem-Merchant X EARTH Level 3 [ Spellcaster / Effect ] ATK 1000 DEF 1000 During the Damage Step, when an EARTH Normal Monster you control battles (Quick Effect): You can send this card from your hand to the GY

The threat of activation is something that your opponent really has to consider on a board with a few other Toxic creatures

The only feasible way I can come up with though is to remove booster packs from the trading feature

Part of the power of targeted discard is that it allows you to answer powerful expensive threats (like Approach of the Second Sun or Gifts Ungiven) for a low cost (often a single mana), so in some sense, you are trading up in mana

Then draw 7 new cards