Pretty much what the title says. I want to implement something similar to what is used in Terraria: textured tile-based (by which I mean comprised of physical blocks - just in case) modifiable terrain (in 2D, side view). Except with a lot more tiles to draw (I intend to use variable zoom; my current hopes are to draw about 150,000 tiles at the camera's furthest, but I'd still need 4x4 textures for when the camera is up close). What would be the fastest way to draw this? Or maybe I'm way in the dream land here?
On a somewhat related note, I'm currently using textured quads to draw objects, because I've read that ID3DXSPRITE is deprecated, not as flexible, and so on. Is this true?