For 2-black-or-green, Fiend Artisan is a 1/1 that gets +1/+1 for each creature in your graveyard, and has the power to sacrifice creatures to summon other creatures for the same converted mana cost
Cards printed soon after the game was released are especially valuable, and even commons and uncommons might be worth $5 each or more
While Seal of Cleansing might be more powerful than Disenchant in the present day, Disenchant ruled the roost as the enchantment/artifact removal spell of choice for a majority of Magic history
Incapsula incident ID: 679000170039568026-114899961579504720
Courser Pegasus is a little too powerful at common, so powerful in fact that Wizards of the Coast made it uncommon in Guilds of Ravnica
When designing for print, always include a 3-millimeter bleed margin on each side to allow precise trimming without cutting into the frame