Its a risky maneuver that can pay off if youre confident in your ability to win, because this often generates 6 or 7 mana itself
Dishonorable Mentions: Rhystic Study + Smothering Tithe Rhystic Study and Smothering Tithe are two of Commander's strongest cards because you have three opponents to trigger them and time to play 3- and 4-mana enchantments that don't impact the board
Ezio, Auditore da Firenze + Jensen Carthalion, Druid Exile Waning a bit after last years excitement, Ezio Auditore da Firenze is a fun casual assassin typal commander, but the real reason folks tried to make this work in cEDH was that its a 5-color 2-drop commander with nary an assassin in the deck
You control your opponents while they're searching their libraries
The copy effect lasts indefinitely
Often too difficult to cast, the upside is rarely worth destroying your mana base for