The most obvious target would be extra combat spells, especially if you've adding on some mana generators from attacking (various treasure generators, Neheb, some dragons)
What is the Sword and Shield Evolving Skies booster box worth
Ultimately, patience and caution are key: these cards are valuable, so ensure you buy from reputable sources and consider grading high-condition copies to protect and potentially increase their value
If a nonland card is discarded, put a +1/+1 counter on the creature that is Conniving
card game you might've played in 2004 or 2019: You summon monsters, activate spells, and spring traps to clear your opponent's board (or keep them from building one in the first place), and then attack them until they run out of life points