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Equivalent cards to Piranha Marsh (assuming you mean Piranha Marsh, a black land, since Piranha Fly isn't a MTG card) are:
Both are black lands with ETB or tap-activated effects.
Reason: Looking for black lands with damage or similar ETB abilities. If you meant a different card, please clarify!
| Color: |  |
| Identifies: |  |
| Cost: | |
| Rarity: | Uncommon |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: | 
        |
| Layout: | Normal |
| Rank: | |
| Saltiness: |
: Add .)
This land enters tapped.
, : Each opponent loses 1 life. Activate only if you control two or more black permanents. | Color: |  |
| Identifies: | |
| Cost: |
 |
| Rarity: | Common |
| Converted Cost: | 2 |
| Power/Toughness: | 2/1 |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.01 USD / 0.02 USD |
| Cardmarket | 0.02 EUR / 0.03 EUR |
| Cardkingdom | 0.35 USD / 0.49 USD |
| Cardsphere | 0.02 USD |
| Color: | |
| Identifies: | |
| Cost: | |
| Rarity: | Common |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
: Add . | Color: | |
| Identifies: |  |
| Cost: | |
| Rarity: | Uncommon |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.49 USD / 6.07 USD |
| Cardmarket | 0.24 EUR / 2.2 EUR |
| Cardkingdom | 0.69 USD / 5.99 USD |
| Cardsphere | 0.48 USD |
: Add or . | Color: | |
| Identifies: | |
| Cost: | |
| Rarity: | Uncommon |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
: Add .)
This land enters tapped.
, : Each opponent loses 1 life. Activate only if you control two or more black permanents. | Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Common |
| Converted Cost: | 2 |
| Power/Toughness: | 2/1 |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.01 USD / 0.02 USD |
| Cardmarket | 0.02 EUR / 0.03 EUR |
| Cardkingdom | 0.35 USD / 0.49 USD |
| Cardsphere | 0.02 USD |
| Color: | |
| Identifies: | |
| Cost: | |
| Rarity: | Common |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
: Add . | Color: | |
| Identifies: | |
| Cost: | |
| Rarity: | Uncommon |
| Converted Cost: | 0 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.49 USD / 6.07 USD |
| Cardmarket | 0.24 EUR / 2.2 EUR |
| Cardkingdom | 0.69 USD / 5.99 USD |
| Cardsphere | 0.48 USD |
: Add or . 
