I attacked with [[Durnan of the Yawning Portal]] triggered his ability and exiled [[Arcbound Reclaimer]]. When I tried to cast it, it still cost 4 mana despite it gaining undaunted and me having three opponents.
#Durnan's undaunted ability doesn't work
gaunt spindle
steady shoreBOT
Legendary Creature — Human Warrior
Whenever Durnan attacks, look at the top four cards of your library. You may exile a creature card from among them. Put the rest on the bottom of your library in any order. For as long as that card remains exiled, you may cast it. That spell has undaunted. (It costs 
less to cast for each opponent.)
Choose a Background (You can have a Background as a second commander.)
3/3
