Mirror Mastery

Mirror Mastery is a 100-card Commander precon from Commander 2011, released June 17, 2011. It is led by Riku of Two Reflections, a Temur commander.

Riku of Two Reflections

Whenever you cast an instant or sorcery spell, you may pay . If you do, copy that spell. You may choose new targets for the copy.
Whenever another nontoken creature you control enters, you may pay . If you do, create a token that's a copy of that creature.

The list runs 41 lands and 24 creatures, and its nonland cards average 4.24 mana. At today's TCGplayer prices the whole deck's cards come to about $117.67, and the most valuable is Animar, Soul of Elements at $32.62.