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Note: I will be primarily discussing these card's implications in non-rotating formats, so please keep that in mind

Memory Sluice is also a really bad return unless you can really reliably trigger it's Conspire ability

Marvo would be a great commander for a deck manipulation strategy to get big-mana spells cast after winning clashes, but you're better off making a fresh deck that better supports this strategy

Side Deck 15 Mulcharmy Purulia X WATER Level 4 [ Aqua / Effect ] ATK 100 DEF 600 If you control no cards (Quick Effect): You can discard this card

Get your Karlov of the Ghost Council, Dawn of Hope, and Archangel of Thune ready, they are about to see even more play

However, this cards other ability makes this difficult