While oversimplified, the concept of card quality quickly gets to the root of what makes Imperial Seal and Vampiric Tutor (heck, tutors in general) as strong as they are, how their power level scales as high as it does, and why theyll continue to see play for years to come
It can be a little slow due to needing Equipment and Auras already in play for Halvars triggered ability to work, but its worth it since it triggers on every combat
Put a +1/+1 counter on it and untap it
Hope you like it
It doesn't lose it as the turn ends or if another player gains control of it
Sure, 4 mana is considered a little above average for reanimation strategies, but once you start pairing this commander with Training Grounds and Cabal Coffers, you can create several potent tokens a turn, then use your new Zombies to filter through the top of your deck during your upkeep to find the card you need to close the game