Winter Orb

As long as Winter Orb is untapped, players can't untap more than one land during their untap steps.

Snow-Covered Forest

({T}: Add {G} or {U}.)
Rimewood Falls enters tapped.

({T}: Add {U} or {B}.)
Ice Tunnel enters tapped.

Frost Marsh enters tapped.
{T}: Add {U} or {B}.

({T}: Add {B} or {G}.)
Woodland Chasm enters tapped.

{T}: You may play target snow permanent card from your graveyard this turn. If you do, it enters tapped.

Whenever Jorn attacks, untap each snow permanent you control.