Even before he flips, Avatar Aang is an absurd value enginedrawing cards off bending and pushing you to play with all four elements
Im not going to talk about the back side of this card because, well, it doesnt matter all that much
Theres plenty of value here, especially with that cheap spell-copy ability, but Id rather put that ability to use in the 99 of a commander like Niv-Mizzet, Parun or Narset, Enlightened Exile
Your opponent that had that turn one fast start with their enabler or payoff or combo in plain sight on top of their deck can change how your table approaches the game, and Field of Dreams might assist in making sure the tables threat assessment or removal is pointed in the right direction
If the cut is very real, we have a few options
Graveyard hate demolishes self-mill decks all the time