The Nordraldd Expedition

At the beginning of each upkeep, pay {3} or
sacrifice The Nordraldd Expedition.
At the beginning of each end step, put a
Runebreak counter on this enchantment.
At the beginning of your upkeep, if there are
eleven or more Runebreak counters on The
Nordraldd Expedition, sacrifice it. Create a
20/20 blue Leviathan with reach, trample, and
vigilance. You may search your library for up to
X merfolk and put them onto the battlefield,
where X is your devotion to blue.