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Cavern Harpy

Creature — Harpy Beast

Flying
When this creature enters, return a blue or black creature you control to its owner's hand.
Pay 1 life: Return this creature to its owner's hand.

CMC
2
Mana cost
{U}{B}
Color identity
BU
Rarity
common
Set
The List
Price
$0.31
EDHREC rank
#15894
Buy on TCGplayer
Cavern Harpy card art
Cavern Harpy enters, bounces a blue or black creature you control, and does it for free under Aluren — that loop is the whole reason it exists. The one-life payment per bounce is the cost of an engine, not a drawback, and Mairsil, the Pretender decks exploit exactly that repeatability.

Best Commanders

Commanders with the highest synergy

01
Mairsil, the Pretender

Mairsil, the Pretender

57.0% of decks · synergy 0.57

Mairsil, the Pretender exiles Cavern Harpy to gain its activated-style bounce loop, letting Mairsil flicker itself to re-cage new abilities turn after turn — it's the primary reason Cavern Harpy shows up in over half of all Mairsil lists.

Format Analysis

Where it lives, where it can’t

FormatVerdict
commander legal
legacy legal
modern not legal
pioneer not legal
standard not legal
vintage legal
pauper legal
oathbreaker legal

Cavern Harpy is legal in Commander, Legacy, Vintage, Pauper, and Oathbreaker, and Commander is where it does its real work — the Aluren combo is a known quantity at higher-power tables and the card is essentially unplayable outside that context. In Legacy, the Aluren shell has seen fringe play but the format has faster, more consistent win conditions that have pushed it to the margins. Pauper legality is technically correct but irrelevant; the combo pieces it needs don't exist at common. Treat this as a Commander card with legacy footnotes.

Key Combos

Combo lines featuring this card

Price Context

Current price

$0.31 bulk tier

At $0.31, Cavern Harpy is pure bulk — it costs less than a sleeve. Demand is narrow enough that the price is unlikely to move unless Aluren combo decks see a sharp spike in Commander popularity.

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Sources

Mentioned

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Updated . Data from Scryfall, EDHREC, and Commander Spellbook.