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Thought Vessel is a decent mana rock, but the deck already has quite a few mana rocks, and having an unlimited hand size doesn't seem like it's all that useful

Not at all

Whenever you cast a spell, choose up to one Return target spell you don't control to its owner's hand

Soulherder is one of the strongest

They do require some setup to be at their strongest, and opponents to not have tokens or other small materials to sacrifice

It lets you draw cards any time a Swamp enters the battlefield under your control, and if you need to deal two points of damage to any target and gain a little bit of life you can do that instead