A few times I asked staff about stock, and the answer always came back as some variation of the following: "We don't get them in very often
A card like Clive, Ifrit's DominantClive, Ifrit's Dominant exiles after paying a cost and then comes back transformed as Ifrit, Warden of InfernoIfrit, Warden of Inferno, and since he's left the battlefield, this means Ifrit will have summoning sickness
Flanking him are the God-Eternals, an assembly of beings who were worshiped as gods on the Egyptian-inspired world of Amonkhet, where Bolas built an army with which to invade the city plane of Ravnica with the God-Eternals as his generals
Walk-In Closet's ability doesn't allow you to activate abilities (such as cycling) of land cards in your graveyard
Essentially, the target must discard one card per black mana used, making it a super powerful option capable of winning games for players