mtg cookbook card The Underworld Price reveal it Magic The Gathering - Modern

And among the cards you could draw into is a powerful enchantment from the older Dragons of Tarkir set, Assault Formation

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Flash is very important as against target removal, it acts like a counterspell

Because of this, the way Secret Lair drops gain excess value is by having a high number of cards in an absolute sense, with some of these cards likely having inexpensive original printings but that end up having more valuable Secret Lair printings

Afterwards, however, I realized there was a lot more to be done

The card is sweet but easily dealt with so I didn't want to put a full playset, but it is has enough upside to where I'd throw a few copies in