At this stage, Bloodline Keeper / Lord of Lineage is still a token machine, but it's beefed up and gives all other vampires under your control +2/+2
If youre looking to copy something so that you can get its enters-the-battlefield trigger (ETB), then it probably doesnt matter if it sticks around for very long

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At the tournaments end, me and my Robin Hood Shift Deck went undefeated
Secret Lair x Marvel's Spider-Man Superdrop Breaking news
Dont Ink, or Mulligan, The Queen, Commanding Presence if shes in your opening hand Grumpy, Bad-Tempered gives all Dwarfs plus-one power