Adena and Odin, Scavengers

Trample
When Adena and Odin, Scavengers deals combat damage to a player, search your library for a basic forest or basic mountain card and exile it under
Adena and Odin, Scavengers.
When Adena and Odin, Scavengers leaves the battlefield, put all basic land cards under them
onto the battlefield tapped and under your
control.