Rot-wither Wyrd

Mill three cards, then return a permanent from
your graveyard to your hand. If a land was milled
this way, you may instead return a land
from your graveyard to the battlefield.
Living Spell: {b}{g} (As you cast this spell, you may
pay its living spell cost; if you do, as it resolves it
enters the battlefield as a creature)
{t}, {b}{g}: Mill X, where X is Rot-wither Wyrds
power, then return X lands from your graveyard
to the battlefield. Rot-wither Wyrd
deals X damage to you.