Cheapest priced copy (Foundations Jumpstart): $10.99 at Card Kingdom, near mint, their price list as of .
Fumulus, the Infestation 
Legendary Creature — Vampire Insect · 2/2 · Rare · Foundations Jumpstart · #42
Flying, deathtouch
Whenever a player sacrifices a nontoken creature, create a 1/1 black Insect creature token with flying.
Whenever an Insect, Leech, Slug, or Worm you control attacks, defending player loses 1 life and you gain 1 life.
Legal inCommanderLegacyVintage
Not legal inBrawlStandardPioneerModernPauper
1 printing · $10.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Foundations Jumpstart | 42 | Rare | $10.99 | — |
2 rulings from Wizards of the Coast
- 8 November 2024If a nontoken creature is sacrificed to pay a cost of a spell or ability, Fumulus's thirdsecond ability will resolve before that spell or ability. Conversely, if a nontoken creature is sacrificed during the resolution of a spell or ability, that spell or ability will finish resolving before Fumulus's second ability is put onto the stack.
- 8 November 2024If you sacrifice Fumulus, its thirdsecond ability will still trigger.