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There is no official Magic card named Holy Cow. If you mean cards similar to a white creature with humorous or bovine flavor (possibly from Un-sets):
Reason: These are white creatures with either humor or cow themes, fitting closest to your request.
| Color: |  |
| Identifies: | |
| Cost: |
  |
| Rarity: | Rare |
| Converted Cost: | 3 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: | 
     |
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.81 USD |
| Cardmarket | 0.59 EUR / 2.65 EUR |
| Cardkingdom | 1.49 USD |
| Cardsphere | 0.66 USD |
| Manapool | 0.77 USD |
| Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Common |
| Converted Cost: | 3 |
| Power/Toughness: | 2/2 |
| Types: | |
| SubTypes: | |
| Languages: |
  |
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.09 USD / 0.15 USD |
| Cardmarket | 0.07 EUR / 0.13 EUR |
| Cardkingdom | 0.35 USD / 0.49 USD |
| Cardsphere | 0.11 USD |
| Manapool | 0.15 USD / 0.15 USD |
| Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Common |
| Converted Cost: | 2 |
| Power/Toughness: | 2/2 |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Seller | Price |
|---|---|
| Tcgplayer | 0.22 USD |
| Cardmarket | 0.13 EUR |
| Cardkingdom | 0.35 USD |
| Cardsphere | 0.28 USD |
| Manapool | 0.2 USD |
, Do the Hokey Pokey: Prevent all damage a source of your choice would deal to this creature this turn. (To do the Hokey Pokey, choose an arm, a leg, or your whole self and put it in. Put it out. Put it in. Shake it all about. You do the Hokey Pokey! Turn yourself around.) | Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Rare |
| Converted Cost: | 3 |
| Power/Toughness: | / |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.81 USD |
| Cardmarket | 0.59 EUR / 2.65 EUR |
| Cardkingdom | 1.49 USD |
| Cardsphere | 0.66 USD |
| Manapool | 0.77 USD |
| Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Common |
| Converted Cost: | 3 |
| Power/Toughness: | 2/2 |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Rank: | |
| Saltiness: |
| Seller | Price |
|---|---|
| Tcgplayer | 0.09 USD / 0.15 USD |
| Cardmarket | 0.07 EUR / 0.13 EUR |
| Cardkingdom | 0.35 USD / 0.49 USD |
| Cardsphere | 0.11 USD |
| Manapool | 0.15 USD / 0.15 USD |
| Color: | |
| Identifies: | |
| Cost: |
|
| Rarity: | Common |
| Converted Cost: | 2 |
| Power/Toughness: | 2/2 |
| Types: | |
| SubTypes: | |
| Languages: |
|
| Layout: | Normal |
| Seller | Price |
|---|---|
| Tcgplayer | 0.22 USD |
| Cardmarket | 0.13 EUR |
| Cardkingdom | 0.35 USD |
| Cardsphere | 0.28 USD |
| Manapool | 0.2 USD |
, Do the Hokey Pokey: Prevent all damage a source of your choice would deal to this creature this turn. (To do the Hokey Pokey, choose an arm, a leg, or your whole self and put it in. Put it out. Put it in. Shake it all about. You do the Hokey Pokey! Turn yourself around.) 
