Dain, the Deathless

Eminence: As long as Dain, the Deathless is in
the command zone or the battlefield, other
dwarf spells you cast cost {2} less to cast.
Mountainwalk, Indestructible, Hexproof
When Dain , the Deathless leaves the battlefield, return it to the command zone.
When Dain, the Deathless
enters the battlefield, you may pay {x}.
If you do, create X 3/3 red Dain Ironfoot
creature tokens.