Ice Realm of Elnia

Mana in your mana pool can now be spent as any
mana color. All mana have ability: "{t} get {e}{e}{e}."
Pay 15 {e} and gain "{s}{s}{s}"
Pay 12{s}and exile all but the bottom seven cards
of target players library. Player exiles there hand
and then uses those final seven cards as there
hand. After this step pay another 3{s}and give
target creature: "{t},{2}kill target creature."