So, the companions are legendary creatures who begin outside your starting deck and have great influence over the rest of your deck
Perhaps we'll see other subtypes emerge going forward, such as flower (Black Lotus, Lotus Bloom, etc.), Jewel (Moxes, Jeweled Amulet, etc.), and orb (Winter Orb, Zuran Orb, Chaos Orb, etc.)
Again, theres enough value here that you dont need to stress about building around too much in a color that can protect Trisk
Sacrifice after III.) I Crescent Fang Search your library for a basic land card, put it onto the battlefield tapped, then shuffle
Tapestry Warden If your deck plays with big butts, Tapestry Warden is right at home
Ramping with spells like Cultivate ensures you can get Morska into play quickly