Typically, the extra cost for the Treasure tokens is worth it, as it gives you more mana flexibility later down the line
This effect can only be used once per turn, but considering players only put that much on the board to end someone, once per turn might actually be too frequent
EFFECT Choose 1 Spell/Trap on your opponents field and destroy it
Deal with the Devil: His deal with the Door is treated as this, with it being stated that he'll gain great power, but lose what he holds most precious (and he comes up with about half a dozen examples of what that is by the end of the series, with it being left deliberately ambiguous as to what Yuma gave up)
goals have been met, new ones are on the horizon, grading is still popular than ever, and cards are still finding their way in binders