Avediel, Divided Devotee

Whenever one or more creatures you control deal combat damage to a player, choose Seraphs or Usurpers:
Seraphs - put an exalted counter on target land you control and draw a card. If only one creature attacked this turn, you may search your library for a basic plains card
and put it onto the battlefield tapped. Then shuffle.
Usurpers - mill two cards and draw a card. If only one creature attacked this turn, return a land from your graveyard to the battlefield tapped.