It doesnt have to return itself, which is nice, but it forces your hand with other creatures
This creates a premium, debossed texture that players can actually feel with their fingertips
Shining Charizard sells for $1,500 Ungraded and Graded can range anywhere from $2,000+ to nearly $12,000, with the latter being a PSA 10 grading
When you rely on very specific cards to win, the risk presented by Demonic Bargain is considerably more dangerous, as exiling a key card can take you out of the game instead of creating a significant inconvenience
The big time reward is when you come out of that risky/powerful avatar state, and transform back to Avatar Aang as four new cards, a sizable buff, and Warleader's Helix to opponent's domes is almost certainly worth it on the first upkeep possible