Peace of Enrac

When Peace of Enrac enters the battlefield and whenever a land enters the battlefield under your control, put a flowstone counter on a land you
control or a card in the Sanctum or a graveyard.
You may play land cards from the Sanctum as
though they had flash.
Players can't cast spells with flowstone counters
on them, nor can opponents play lands with
flowstone counters on them.
Lands with flowstone counters on them are
indestructible.