Wall of Flame

Channel — {r} (This card remains in play. At the
end of your turn, return this card to your hand unless
you pay it's channel cost)
You can't target other players with spells. You
can't be the target of spells played by other players. Creatures you control can't attack. You and
creatures you control can't be attacked or targeted
by other players or creatures. When you stop channeling this spell, it remains in effect until the
Beginning of your next turn.