Jorn, Lord of Frost

Signature {1}{u}{b}(As you cast this spell you may pay
the signature weapon cost, if you do copy this spell, the
copy enters the battlefield transformed)
When this creature dies, return it to its owner's
hand at the beginning of the next end step
Whenever a snow permanent enters the
battlefield under your control, gain 2 life, mill 2,
then return target snow permanent card from
your graveyard to your hand if this is the first
time this ability has resolved this turn