Rizontie, the Silver Queen

All permanents you control are snow permanents
in addition to their other types.
Flying, double strike, hexproof.
{1}{s}, Target creature becomes tapped, it doesn't
untap during its controller's next untap step. At
the end of each player's turn, Rizontie, the Silver
Queen deals 1 damage to each creature that was
tapped by this ability.