This includes the classic Lich, but also Lich's Mastery, Exquisite Archangel, and Platinum Angel
Rhystic Study often gets a draw off of every spell an opponent casts even when they know the unwritten rule when facing a Rhystic Study- "ALWAYS PAY FOR RHYSTIC STUDY." And make no mistake, always pay
Remember that even if you only have one creature in play to bestow upon, the Eidolon will, worst-case scenario, grant +2/+2, counting itself and the creature you are bestowing on
The other best attack is Sky Spear, which is similar to Garchomp C's Dragon Rush (C)
The value that the card offers from use of its abilities abstractly is clearly not up to par with many planeswalkers, but the strength comes from the ability to cast it on the opponents turn as well as the ability to shake up combat on that turn
Then when this swings you can trade a Food for milling three and putting a permanent from them to your hand