Having that calculated before weakness and resistance can upset the momentum of an entire battle
Cards like Myrkul, Lord of Bones, Teysa Karlov, and The Meathook Massacre have amazing interactions with The Sibsig Ceremony
excavate the top cards of your Deck until you excavate a "GMX" card, add that "GMX" card to your hand, also shuffle the rest into the Deck
This powerful effect can drastically change the state of the game, potentially wiping out an opponent's field of monsters in one fell swoop
Theres nothing smart about timing the market or when to buy these cards so long as you have the money it takes to buy them, their value always tends to go up over time
While it doesn't happen often Griselbrand is even hardcast in the cube