Devoid When Murk Strider enters, you may put a card an opponent owns from exile into that player's graveyard. If you do, return target creature to its owner's hand.
Other green creatures you control get +1/+1. Other blue creatures you control get +1/+1. Untap all green and/or blue creatures you control during each other player's untap step.
Delve Flying Murktide Regent enters with a +1/+1 counter on it for each instant and sorcery card exiled with it. Whenever an instant or sorcery card leaves your graveyard, put a +1/+1 counter on Murktide Regent.
As Murmuring Bosk enters, you may reveal a Treefolk card from your hand. If you don't, Murmuring Bosk enters tapped. {T}: Add {W} or {B}. Murmuring Bosk deals 1 damage to you.
{3}, {T}: Target player exiles a card from their hand. Activate only as a sorcery. {1}: Choose a card exiled with Muse Vessel. You may play that card this turn.