Joraga Warcaller [Commander 2014] SV79 each player takes a hand

each player takes a hand of four leaders and may play one at the start of each of the three Ages

Upon their return

This plays very similarly to the flood mechanic in the Atlantis scenario from the Atlantis and Das Buch scenario packs

which can instead be built as Palisade Drop Pods

gather essences

Joraga Warcaller [Commander 2014] SV79 each player takes a handSet: Commander 2014 Type: Creature Elf Warrior Rarity: Rare Cost: {G} Multikicker {1}{G} (You may pay an additional {1}{G} any number of times as you cast this spell.) Joraga Warcaller enters the battlefield with a +1 +1 counter on it for each time it was kicked. Other Elf creatures you control get +1 +1 for each +1 +1 counter on Joraga Warcaller.