Magus
The Magi are a group of cycles featuring Human Wizards that reference other cards from Magic's history. Each cycle of Magi copy a different type of card. So far there have been Magi cycles made for Artifacts, Enchantments, Lands, and a fourth cycle that is being made for Sorceries. The Magi Cycles first debuted in the Time Spiral block and were featured in Time Spiral, Planar Chaos, and Future Sight. Since then, a mega-cycle has been made within the Commander sets, releasing another card of the cycle each year.
Artifact Magi - Time Spiral
These Magi were the first cycle to be released and feature Magi who have identical Converted Mana Costs to the Artifacts they mimic. They each have activated abilities.
Magus of the Disk - Nevinyrral's Disk
Magus of the Mirror - Mirror Universe
Magus of the Scroll - Cursed Scroll
Magus of the Candelabra - Candelabra of Tawnos
Enchantment Magi - Future Sight
The Enchantment Magi have no activated abilities, instead just having abilities exactly like the Enchantments they mimic.
Magus of the Future - Future Sight
Magus of the Abyss - The Abyss
Magus of the Moon - Blood Moon
Magus of the Vineyard - Eladamri's Vineyard
Land Magi - Planar Chaos
Magus of the Tabernacle - The Tabernacle at Pendrell Vale
Magus of the Bazaar - Bazaar of Baghdad
Magus of the Coffers - Cabal Coffers
Magus of the Library - Library of Alexandria
Unlike the other Magi cycles, these Magi have been released over the course of many Commander sets. The cycle will continue into Commander 2018 and finish with Commander 2019.
Magus of the Mind - Mind's Desire