One of the issues you can face when building a deck with so many options made more complex by having access to four colors is decision paralysis
Syr Konrad, the Grim While this next card isnt in the same realm of price, Syr Konrad, the Grim is a popular Commander card thats receiving a gorgeous bonus sheet reprint
With delve, you can cut the cost of Treasure Cruise down to just one blue mana, though you need a fair number of cards in the graveyard to do so
Illustrated by Heonhwa Standard Not Legal Alchemy Not Legal Pioneer Legal Historic Legal Modern Legal Brawl Legal Legacy Legal Comp
And if that's not complicated enough, similarly, if one of the top two cards of your library is a transforming double-faced card, you put it into the new sleeve with either face of the card facing outward, and it still becomes a modal double-faced card at the end
Emerald/Ruby Starter Deck Strategy Get your Max Goof and Powerline Singers out on the board, and reap the benefits