Xenagor, Bane of Planets

Haste, Trample, Other Wurm Creatures Cost {b}{r}{g} less for You to Cast.
Whenever Xenagor, Bane of Planets Attacks,
Reveal the Top Card of Your Library, if it's a
Land Card, You may Send it to the Graveyard,
if You do, Xenagor, Bane of Planets and up to
One other Wurm Creatures You Control
Becomes Unblockable until End of Turn,
otherwise Put it into Your Hand.