Blood Rite The Vampire deck stands out to me as the most relevant to supporting its corresponding type in a Cube, with meaningful support up and down the mana curve and notably offering some cheap white Vampires, which we really only see on Ixalan
Once an action card is played and its ability resolves, the card is discarded
The ONE Three-Drop (and Alternatives) The three-drop slot is definitely where the choice most depends on what version of the deck you are playing, with the most aggressive versions even eschewing them completely
From versatile adventures to brand-new tutors and powerful game-enders, there are dozens of strong and flavorful new cards just waiting to be pulled in Wilds of Eldraine
(Artifacts, legendaries, and Sagas are historic.) Essentially, The Fourth Doctor lets you play with the top card of your library revealed only to you
Now, go charge your weapons, align yourself with a kami spirit (or don't!), and prepare to seize control of your own corner of Kamigawa!