Cheapest priced copy (Avacyn Restored): $0.35 at Card Kingdom, near mint, their price list as of .
Howlgeist 
Creature — Spirit Wolf · 4/2 · Uncommon · Jumpstart 2022 · #673
Creatures with power less than this creature's power can't block it.
Undying (When this creature dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.)
Legal inCommanderModernLegacyVintage
Not legal inBrawlStandardPioneerPauper
2 printings · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Avacyn Restored | 182 | Uncommon | $0.35 | $0.49 |
| Jumpstart 2022 | 673 | Uncommon | $0.35 | — |
One ruling from Wizards of the Coast
- 1 May 2012The comparison of power is performed only when blockers are declared. Increasing the power of a blocking creature (or decreasing the power of Howlgeist) after this point won’t cause any creature to stop blocking or become unblocked.