Ravisher of the King's Land

Ravisher of the King's Land enters the battlefield
with X 1/1 counters.
•{x}{x}{x}{x}, Tap X lands an opponent controls.
•{b}{b}{4}{t}, Lands you control tap for an
additional mana produced by that land.
Whenever Ravisher of the King's Land deals
combat damage to a player, they must sacrifice an
untapped land, if they can't, they lose half their
life, rounded up.