This fascinating pairing relies on Intruder Alarm to completely bypass Ulamog's Dreadsire’s usual need to wait a turn cycle. Whenever Ulamog's Dreadsire taps to create a 10/10 Eldrazi token, Intruder Alarm's global trigger sees the new arrival and immediately untaps all creatures, including Ulamog's Dreadsire itself. This creates a self-sustaining loop that floods the board with colossal threats and gives you an army ready to attack or tap for mana right away.