Because normally it doesnt get card draw as good as Chandra, Pyromaster and Read the Bones, it normally doesnt get such a good sweeper (Anger of the Gods), and it normally doesnt get so much good discard
Vindicate allows decks to contain free land destruction along with artifact and enchantment removal without having to devote any space to such utility or ever risk having their creature removal or anything else stuck in their hand
This is perhaps the most unique holiday card
If you do, target player discards a card
Lastly, you can revive it from the Graveyard by discarding your entire hand, oh and it got 5000 ATK, so it's a heavy beater too
To the future I saw people mocking the forbidden card 'Ib the World Chalice Priestess' for being unbanned but not actually strong anymore, so I decided to use it, thinking that couldn't possibly be true