Whisper, Blood Liturgist | Intruder Alarm | Avenger of Zendikar

Cards

You control at least two other additional creatures and at least three lands.
An additional creature in your graveyard or on the battlefield under your control.
Whisper does not have summoning sickness.

Activate
Whisper by tapping it and sacrificing two other creatures, returning
Avenger of Zendikar from your graveyard to the battlefield.
When
Avenger of Zendikar enters the battlefield, it triggers itself and
Intruder Alarm.
Resolve the
Intruder Alarm trigger, untapping all creatures.
Resolve the
Avenger of Zendikar trigger, creating at least three 0/1 Plant creature tokens.
Activate
Whisper by tapping it and sacrificing
Avenger of Zendikar and a Plant token, returning any creature card from your graveyard to the battlefield.
When that creature enters the battlefield,
Intruder Alarm triggers.
Resolve the
Intruder Alarm trigger, untapping all creatures.
Repeat.