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The Southern Air Temple is a White legendary Shrine that places a number of +1/+1 counters on each creature you control equal to the number of Shrines you control when it enters play and adds another +1/+1 counter to every creature any time another Shrine enters play under your control

Death with Benefits ( Chasm Skulker, Dragon Egg, Rukh Egg, Roc Egg, Matter Reshaper, Sprouting Thrinax, Tuktuk the Explorer, Academy Rector, Aura Thief, Corpse Augur, Mindslicer, Reef Worm, Solemn Simulacrum, Archon of Justice, Seedguide Ash, Destructor Dragon, Deadwood Treefolk, Scuttling Doom Engine, Wurmcoil Engine, Symbiotic Wurm

if it wasn't, Valakut's count goes down by one

If any of them have a triggered ability that triggers whenever a creature enters the battlefield, they'll trigger for one another