Oragan, House Deputy

Whenever a Mercenary enters the battlefield
under your control, if you didn't cast it, target
Mercenary with converted mana cost 4
or less gains swampwalk until end of turn.
{2}{b}, {t}, Sacrifice a Mercenary: Search your
library for a Mercenary with converted mana
cost equal to the sacrificed Mercenary minus
one, put it onto the battlefield, then shuffle
your library.