---
name: "Yahenni's Expertise"
mana_cost: "{2}{B}{B}"
cmc: 4
type_line: "Sorcery"
colors: ["B"]
color_identity: ["B"]
keywords: []
set: "PAER"
set_name: "Aether Revolt Promos"
collector_number: "75"
rarity: "rare"
artist: "Jason A. Engle"
oracle_id: "692babfa-9b74-415e-a560-abae4ccb006b"
canonical_url: "https://avascry.com/printing/yahennis-expertise-paer"
legalities:
  commander: "legal"
  standard: "not_legal"
  modern: "legal"
  pioneer: "legal"
  legacy: "legal"
  vintage: "legal"
  pauper: "not_legal"
  penny: "legal"
---

# Yahenni's Expertise
- **Mana Cost:** `{2}{B}{B}` (CMC: 4)
- **Type:** Sorcery

## Oracle Text
All creatures get -3/-3 until end of turn.
You may cast a spell with mana value 3 or less from your hand without paying its mana cost.

## Top 4096-Dim Neural Synergies
1. [Witch's Vengeance](/printing/witchs-vengeance-peld.md) — Sorcery
2. [Infest](/printing/infest-prm.md) — Sorcery
3. [Shrivel](/printing/shrivel-m14.md) — Sorcery
4. [Languish](/printing/languish-pori.md) — Sorcery
5. [Glistening Deluge](/printing/glistening-deluge-mom.md) — Sorcery
6. [Nausea](/printing/nausea-ema.md) — Sorcery

## Printing Details
- **Set:** Aether Revolt Promos (PAER) #75
- **Rarity:** Rare
- **Artist:** Jason A. Engle
- **Total Printings:** 15 across all historical editions

## Format Legalities
Commander: `legal` | Standard: `not_legal` | Modern: `legal` | Pioneer: `legal` | Legacy: `legal` | Vintage: `legal` | Pauper: `not_legal` | Penny: `legal`