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Treasure Cruise enables more decks

There are plenty of quality cards that synergize well with Herald of Secret Streams, and you dont have to work hard to have creatures with +1/+1 counters in this format

It hearkens back to Extort, one of my favorite mechanics of all time because its so simple, so deviously potent, and so perfectly Orzhov

It is worth noting that you need to be careful deploying multiple Kavus against blue decks, as Dress Down can ruin your day if it hits multiple Kavus

Sacrifice is a very common way to tie these three colors together in Cube, though, and there are some nice cards here for Cubes of assorted sub-themes and power levels