Before Creatures Inc
You can build more decks as you play the game and get more cards
1 Eternal Witness Black might be the colour most associated with graveyard reanimation, but green can also do it pretty decently as well
One damage can kill smaller characters or chip away at bigger ones, helping you clear your opponents boards while still bringing in the precious lore you need
Each player discards a card, then loses 1 life, then sacrifices an artifact, a creature, an enchantment, a land, a planeswalker, and a tribal permanent, then exiles a card from their graveyard, then puts the top card of their library into their graveyard, then removes a counter from a permanent they control, then gets a poison counter