As for the question, if you have two in play, each one applies to any draw you would make (besides your normal draw for the turn)
Lets use 151 as an example set quantity that second number represents the advertised number of cards in a set
Dubious Delicacy Rating: 7/10 Removal plus a very tangible bonus is always very good
Im including a bunch of other cards that are already good but are often even better in a Korvold deck: I decided to add Ulamog, the Infinite Grye to the deck mainly for its ability to shuffle my graveyard into my deck
Unfortunately for Seismitoad, this means that its viability even as a fun card is outclassed by this fast meta, because there are other less-than-top-tier decks with the same concept that can place in tournaments
There was also an Ancestral Recall waiting for him in his final pack, the perfect card for his deck with Spellseeker and Snapcaster Mage