You want this kind of card in a Storm deck, but you cant solve it while going off
any lands deck and lots of other decks use Crucible to recycle lands like no one's business
That still doesnt mean youre a bad person for wanting to play such a deck, but you should at least prepare to suddenly become the archenemy at your table if the other players so much as suspect that youre on that game plan
Krav, the Unredeemed Krav, the Unredeemed gives you tons of control over what you sacrifice
Its second-best feature is to double the triggers from the doctors abilities, so The Tenth Doctor can get plenty of Allons-y triggers, while The Ninth Doctor can get an extra upkeep, and so on
This means that the promo cards don't really have any special effects in battle