What lizard for a 7 foot long by 3 feet deep by 4 feet tall enclosure

[Regius_049]

That's a huge enclosure - You could do:

1. Water dragons
2. Argentine Tegu
3. Ackie monitors
4. Eastern Indigo Snake
5. Emerald / Yellow / Blue Tree monitors (maybe a little short, but it is still certainly fine)
6. Sailfin Dragon