Eris, Ingenious Informant

At the beginning of your upkeep, Surveil 1.
Whenever a nonland permanent is put into your
graveyard from your library, you may gain
control of a permanent that shares a Card Type
and Mana Value with it until end of turn.
Once a well-respected engineer under Niv-Mizzet,
now one of Lazav's greatest assets.