The MCSR Practice Map is recommended, as it contains most of the below maps.
MCSR Practice Map (by Dibedy and others)
One Cycle (by Ryguy2k4)
Portals (by Semperzz and ItzToxic)
Bastions (by Llama)
Fortress (by Semperzz)
Zero Cycle/Endfights (by Mescht)
Overworld (by 7rowl)
Crafting (by Semperzz)
Vine Seed SSG (by r0hkx)