The Best of Both Worlds

Enchantment — Saga

(As this Saga enters and after your draw step, add a lore counter. Sacrifice after III.) I — Assimilate target nonartifact creature an opponent controls. (Gain control of it and put a +1/+1 counter on it. It's a Borg artifact creature and loses all other creature types.) II — Artifact creatures you control get +2/+2 until end of turn. III — Exile the Borg assimilated with this Saga, then return it to the battlefield under its owner's control.