The Wayward Survivor

Begin the game with this card revealed.
Only creatures you control take double
damage when its not your turn. Creatures
dealt damage by lands you control don't
untap on their next untap step."
Lands you control are deserts in addition
to their other types. Lands you control
have "{t}: deal 1 damage to target attacking
creature" and "when this card enters the
battlefield, it deals 1 damage to target player."