how do modal cards work mtg

how do modal cards work mtg To Use Double Faced In Magic: The Gathering Modal cards rules question :

Name: how do modal cards work mtg To Use Double Faced In Magic: The Gathering Modal cards rules question :
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In the common example of Griselbrand reanimator decks, big Griz fulfills both tasks

The main redeeming quality here is that you can deal damage to multiple creatures

If you do, search your library for an artifact card with mana value equal to 1 plus the sacrificed artifact's mana value, put it onto the battlefield tapped, then shuffle

We have an exclusive look at the first cards to be revealed from it, including both Gandalf the Grey and The One Ring itself, as well as some insight from the team at Wizards of the Coast