Most Commander decks need at least one boardwipe spell to reset the board if other players have a lot of creatures, but Deathbringer Regent is a little different
As Lord of Lineage, this creature becomes a 5/5, maintains its ability to tap to create a vampire token, while constantly providing other vampires its owner controls with +2/+2
Except for being a Food artifact, having the listed activated ability, and losing all other card types and subtypes, the token copies only what was printed on the original creature (unless that creature is copying something else
Mana Leak (7) and Memory Lapse (7) and even Unsubstantiate (7) are likely all better than Actual Counterspell (6.5) as colour intense spells are often pretty uncomfortable
Like all typal strategies, pirates dont mind the assistance of some changelings
Untapping is not going to happen for each of those, sadly