Bjarnog's Roaming Hut

{t}: Add {c}.
Whenever you discard one or more cards for the
first time each turn, you may pay 2 life. If you
do, add {b}.
{b}{b}{b}: Bjarnog's Roaming Hut becomes an
Elemental creature with base power and
toughness 4/4 in addition to its other types until
end of turn.