Magic is a game that constantly changes, from minute to minute, so to deny your deck a way to deal with a specific problem simply because it decreases your odds of drawing a different card by fractions of a percent, is just silly to me
Sauron works great with several cards from the Lord of the Rings set, which have a very high power level
JPN boxes have risen from 4,752 to around 19,400 (approximately 4x the original retail)
So then you have to think about whether you want to commit to the board to force them out of developing their hand, or whether you think the card you want to deploy is too important for you to jam right into counter magic
Most rare cards are marked by a black star-shaped symbol in the bottom corner, which is a good place to start
Obviously compared to the six drops that do things without mana investment such as Consecrated Sphinx or the Titan cycle she lacks some tempo