Relic Grotto

({t}: Add {b}.)
Deathtouch
When Relic Grotto enters the battlefield, sacrifice
it unless you return a non-Lair land you control
to its owner's hand.
Whenever an artifact card leaves your graveyard,
you may have Relic Grotto become a 4/3 black
Serpent creature until end of turn. It's still a land.
{4}{b}{b}, {t}, Sacrifice a Lair: The sacrificed Lair
deals 1 damage to target creature.