Ambush [2] (You may pay 2 to play this card from your hand face-down at one of your forts.)
Immune [Black], Immune [Red] (This creature cannot be chosen by black or red spells or abilities of black or red creatures, and does not take damage from black or red spells or creatures.)
[AUTO] When this fort is attacked, and this card is in ambush, you may summon this creature.