Dal'lyea of the North

Immortal (Spells and abilities cannot reduce this
creature's toughness less than 1)
Whenever a creature you control explores and
you reveal a snow land, you may pay {g}{u}. If you
do, put the land onto the battlefield.
Metalcraft - At the beginning of your upkeep, if
you control three or more artifacts, create a 1/1 colorless Ahnshae Soldier creature token. It
explores when it enters the battlefield.