mtg sliver commander deck 2023 EDH Deck Hivelord 100 Magic Cards Custom – Moonveil Games none) element.class Sliver ULTIMATE Tribal Includes FOUR

The card that the subgame winner puts onto the main-game battlefield doesn't have to come from the subgame battlefield

There are also plenty of merfolk lords to play, like Merfolk Sovereign, Master of the Pearl Trident, and Merrow Reejerey

Creature - Kraken Color tag templates(None) Simic Sky Swallower Flying, trample Shroud (This creature can't be the target of spells or abilities.) Creature - Leviathan Color tag templates(None) Slinn Voda, the Rising Deep Kicker (You may pay an additional as you cast this spell.) When Slinn Voda enters, if it was kicked, return all creatures to their owners' hands except for Merfolk, Krakens, Leviathans, Octopuses, and Serpents

Gemstone Caverns follows this up

Its easy to replace a basic Forest for this card

A new mechanic, Enlist, takes a little bit of explaining, but it's basically an updated version of banding