The most important thing here is that Yorion, unlike every other card on this list so far, can target all non-lands permanents instead of simply creatures
1 - Sylvan Tutor Green decks already have powerful tutors with Chord of Calling, Archdruid's Charm and even Natural Order to cheat on mana costs, and now, Sylvan Tutor joins this wide range to search for any creature for just one mana
There are also several commons that you should rarely or never play
While you might think Jace, the Mind Sculptor
This is one of those cards which is made worse by looking at the flavour text, which reads: They call it stitchers anaesthesia, a spell to deaden the senses while the mad doctors begin their grisly work. That means that this person is not only alive, but about to be butchered and probably sewn onto a bunch of other people to make a Skaab Goliath or something