Aristocrats decks want a zero-mana way to sacrifice their creatures, and Viscera Seer offers this, along with a valuable scry ability
These are powerful cards that define the meta and are played frequently
In terms of individual cards, Beseech the Mirror and Agatha's Soul Cauldron are both very powerful with potential multi-format implications
2 Mike, the Dungeon Master Mike, the Dungeon Master is a 2/2 human that costs one generic, one green, and one white, and he is an absolute powerhouse You can pay two generic mana and tap Mike to return a creature that was put into your graveyard this turn straight onto the battlefield
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This card is another one of those already-expensive cards that could cover most of the receiving judges rent if sold today