This is a great template for the current UB meta decks, being able to play King T'Challa on your opponent's turn if you leave mana untapped and possibly even in response to them casting a spell that allows them to draw a card
Were getting called scalpers and such, but keep in mind this is all hype around Collector Boosters
Then cycle, for free, all of these cards with a now-zero cycling cost to ramp up your graveyard and to find Songs and Living Death
These promo versions of Cavern of Souls arrive throughout the next year, like the other promos above
Use the power and toughness of the creature from when it was last on the battlefield to determine the power and toughness of the tokens
[1] These cards are rare and only a part of certain expansion sets, collection boxes, and promotional materials