A four-drop 3/3 that doesnt do anything immediately and can only be used at sorcery speed (rather than in response to a burn spell) is nowhere near good enough
This is depicted in a Red, White, and Black card called Fire Lord Zuko, which retains its firebending mechanic, but now has possible combos in MTG tied to ally creatures and casting from exile, which airbending does a lot of
The biggest downside to islandwalk is the risk that your opponent might not be playing blue, but you can easily get around this in a variety of ways
You can run Blood Artist and such
For example: use an Item to fetch a Pokmon, then use that Pokmons Ability to accelerate an extra Energy
Boasting the partner keyword (which means you can have two commanders as long as they both have partner) allows this four-mana Cat to pair with any number of quality bonus commanders, the best of which might be Ikra Shidiqi, the UsurperIkra Shidiqi, the Usurper