Elderfrost Gammoth

Trample, Iceblight, Menace
Enrage— When this creature takes damage for
the first time it gains Rocksteady, any damage
taken after this reduces damage taken by half
again until your next upkeep
{5}{u}{u}: Destroy 3 target lands or enchantments,
this creature gains +1/0 for each land destroyed
and 0/+1 for each enchantment destroyed
{7}{u}{u}: Put 1 +1/+1 on this creature for every
island or snow land you control