How do exploration and Azusa interact? If I have 1 exploration and 1 Azusa in play are the extra land drops 3 or 2?
With that type of effects, when you play a land, say which effect (or rule) allow you to play the land.
When you have Azusa and an exploration in play and you play a land, you may say:
- you play your normal land of the turn: you won't be able to play a land "normally" until your next turn
- you play it using exploration effect: you won't be able to use that exploration effect until your next turn
- you play it using Azusa's effect: you'll be able to play another land using Azusa until EOT, and the nothing more.
So you'll be able to play 4 lands

Don't think of "extra land drop", think of "1 land drop due to the rules, one drop for exploration, 2 for Azusa"; and if you use the two land drops of Azusa, sac it and play another one, add a new "2 land drops with azusa" to your list of available land drops
