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Each of them enters with an additional +1/+1 counter on it if its a creature and an additional loyalty counter on it if its a planeswalker

To go other routes for draw, I would consider including Grothama, All-Devouring to attack/fight/"sac" a bunch of "excess" creatures for draw, or Skullmulcher does similar in a pure sac way, or perhaps Ohran Frostfang, Regal Force, Toski, Bearer of Secrets, Benefactor's Draught, Mind's Eye, War Room, and while Nissa, Voice of Zendikar is off the Elf theme, it's still effective for more than draw

Skreeg

Ancient Guardians will also include hard-to-find older cards to help make your Graveyard rain with monsters so you can pit them against your opponent