I have a question about extra land drops. If I have something that lets me play an additional land, like an Oracle of Mul Daya, and I flicker it after having played a second land in the turn, do I get another land drop?
When you want to play a land, you look at how many lands you’re allowed to play based on the game rules and any other effects currently in effect that let you play extra lands. If the number of lands you’ve played is less than the number you’re allowed to play, then you can play another land.
In the situation you describe, you’re allowed to play two lands on each of your turns and you’ve played two lands this turn, so you can’t play any more lands this turn.
(Note that this process changed a while ago. Before the change you would have been able to play another land in this scenario. However, no one handled the extra land plays correctly, i.e. actually declaring which effect they were using to play each land, so the rules were changed to be more intuitive and match the reality of how most players played.)