If you are mostly playing green decks, then it may not be necessary to have many counters, but less if you use black ones
But when the condition clashes with your gameplan, it poses the question: Is it more beneficial to advance your own board, or prevent an opponent from claiming the Bounty
With The Lunar Whale, you can do that and have a 3/5 flying vehicle thats easy to crew
Those effects are particularly good for this deck's stun and shield counters, keeping opposing creatures locked down and your own creatures safe, as well as for blitzing through the strong effects of your saga creatures
Carrion Feeder and Viscera Seer are two great examples that can also be returned with Shireis ability, though more resilient sacrifice outlets like Altar of Dementia or Ashnods Altar will work perfectly fine here, too
Since it's an instant you can do it at the end of your turn