Having effects tied to creatures is good because creatures affect the board
It isnt a mechanic that does anything on its own, but if you have Lessons in your sideboard, you can get them during the game using any card that says Learn. In other words, when you have a card that has a Learn effect, you get to look at your sideboard and select any card that has the Lesson subtype
If we pull off just a 3-land turn, with both of these out, the Baloth will get to ridiculous size - 16/8 on the first drop, 40/12 on the second, and 88/16 on the third
There will always be exactly one plane card face up in the command zone
If we want to buff him with Equipment, like Argentum Armor or Sword of Hearth and Home, too