When Munda, Ambush Strategist enters the battlefield choose a creature type from among creatures you control.
Whenever Munda, Ambush Strategist attacks shuffle your library then look at the top four cards of your library you may reveal a creature with the chosen type from among them and put it onto the battlefield tapped and attacking target player. Return that creature to your hand at the beginning of the next main phase. Put the rest of the cards on the bottom of your library in any order.
Rally the troops and prepare for a massacre.