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When Eternal Witness enters the battlefield, you can return a card from your graveyard to your hand
So the best thing to do if you cannot attack profitably is to sacrifice them on Altar of Dementia for lethal milling or tap them with Phenax's ability to mill an opponent
Remember, this determines a lot about what the final creature is including power and toughness, the name, and the creature type
A fun example is Emet-Selch, a character from FF14 who eventually becomes a key villain
You Make the Card 4 Magic community to come together to collectively design a Magic card in a process called "You Make the Card." These were tremendously popular, a lot of fun, and resulted in some seriously cool Magic cards