The artifact costs two, spends two, no tapping, and then puts the top card of your graveyard to the bottom of your library a brilliant mana sink and then way to trigger your stuff
This effect is distinctively useful for duelists whose decks focus on summoning Synchro Monsters, like Yusei
I'm not super sure what deck it'll slot into, since the two mana space is pretty packed with plenty of other spells, but it would be interesting to see how they fit into a deck
These generals also tend to need a pretty healthy defensive strategy so your jilted opponents can't just kill you right away
The common gain lands from Khans and Zendikar block offer the best and cheapest option
Vampiric Tutor and its brethren from Mirage Block Enlightened Tutor in white, Mystical Tutor in blue, and Worldly Tutor in green helped to define this style of card alongside the original tutor, which also happens to be the best black tutor of all time