Activate Perilous Forays by paying ({1} magic symbol) and sacrificing another creature, searching your library for a land with a basic land type and put it onto the battlefield tapped.
When the land enters the battlefield, Amulet of Vigor and Felidar Retreat trigger.
Resolve the Amulet of Vigor trigger, untapping the land.
Resolve the Felidar Retreat trigger, creating a 2/2 Cat Beast creature token.
Activate the land by tapping it, adding ({1} magic symbol) .
Repeat.
Results
Put all lands with a basic land type from your library onto the battlefield tapped.