Vailsky, Remnant PlanetJumpers

Vailsky, Remnant PlanetJumpers is black
Pay 1 life, {t}: Reveal the top card of the world
deck, if it is a land card, put onto the battlefield
under your control.
{t}: All lands you control are swamps until the
end of turn. You lose life equal to the number of
half of lands you control. Round up each time.