<p>From the card rulings:</p>

<blockquote>
  <p>9/20/2014: [...] Each copy is created on the stack, so it's not "cast". Abilities that trigger when a player casts a spell won't trigger.</p>
</blockquote>

<p>Since the copy isn't "cast", you don't have to pay attention to any abilities saying "as an additional cost to cast [card]...". This also means that prowess does not trigger.</p>

CC BY-SA 3.0
2015-06-30T12:53:01.400Z
2015-06-30T12:53:01.400Z
Kevin
<p>Collateral damage says:</p>
<blockquote>
<p>As an additional cost to <strong>cast</strong> Collateral Damage ...</p>
</blockquote>
<p>Comprehensive Rule 706.10 says:</p>
<blockquote>
<p>To copy a spell ... means to put a copy of it onto the stack; <strong>a copy of a spell isn’t cast</strong>. ...</p>
</blockquote>
<p>Per 706.10, the copy of Collateral Damage isn't cast, so you don't have to pay the cost again.</p>
<p>Copying a spell does not trigger Prowess. Prowess triggers when you cast a spell, and, as we previously discovered, copied spells are not cast. A ruling on <a class="mtg-autocard" target="_blank" rel="noreferrer" href="https://gatherer.wizards.com/Pages/Card/Details.aspx?name=Howl%20of%20the%20Horde">Howl of the Horde</a> reiterates what we have concluded:</p>
<blockquote>
<p>... Each copy is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger. ...</p>
</blockquote>
<p>Some cards actually copy the card (not the spell) and have you cast the copied card. <a class="mtg-autocard" target="_blank" rel="noreferrer" href="https://gatherer.wizards.com/Pages/Card/Details.aspx?name=Panoptic%20Mirror">Panoptic Mirror</a> is a good example. Just to be clear, this would trigger Prowess.</p>

CC BY-SA 3.0
2015-06-30T18:09:18.447Z
Note that some effects that seem like they are "copying spells" *do* actually cast. In the case of Isochron Scepter and Panoptic Mirror, a *card* is copied and then the copy is cast. (since you can't "copy" a card from exile onto the stack)
Hao Ye
CC BY-SA 3.0
2015-06-30T18:28:20.123Z
@HaoYe That is an interesting note, so I included it.
Rainbolt
CC BY-SA 3.0
2015-06-30T13:08:27.637Z
2015-06-30T18:28:05.670Z
2015-06-30T18:28:05.670Z
Rainbolt
<p>If I cast <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bHowl%20of%20the%20Horde%5d">Howl of the Horde</a> and then cast a <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bCollateral%20Damage%5d">Collateral Damage</a>, I know that I do not need to sacrifice additional creatures for the copies based on <a href="https://boardgames.stackexchange.com/questions/7857/do-i-need-to-sacrifice-again-if-i-copy-goblin-grenade">this question</a>. However, does each new copy trigger Prowess?</p>

CC BY-SA 3.0
2016-01-04T18:44:19.637Z
Possible duplicate of [Do I need to sacrifice again if I copy Goblin Grenade?](http://boardgames.stackexchange.com/questions/7857/do-i-need-to-sacrifice-again-if-i-copy-goblin-grenade)
Drunk Cynic
CC BY-SA 3.0
2016-01-04T20:14:30.760Z
@DrunkCynic The second part of the OP's question isn't answered in the suggested duplicate. Maybe an edit to eliminate the first part and point toward the duplicate, while leaving the second part open.
SocioMatt
<magic-the-gathering>
Will a copied spell trigger Prowess?
Luiz Guilherme
# Will a copied spell trigger Prowess?

(Asked by: username_0 on 2015-06-30)

If I cast [Howl of the Horde](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bHowl%20of%20the%20Horde%5d) and then cast a [Collateral Damage](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bCollateral%20Damage%5d), I know that I do not need to sacrifice additional creatures for the copies based on [this question](https://boardgames.stackexchange.com/questions/7857/do-i-need-to-sacrifice-again-if-i-copy-goblin-grenade). However, does each new copy trigger Prowess?

**Tags:** magic-the-gathering

> **Comments:**
> **username_1**: Possible duplicate of [Do I need to sacrifice again if I copy Goblin Grenade?](http://boardgames.stackexchange.com/questions/7857/do-i-need-to-sacrifice-again-if-i-copy-goblin-grenade)  
> **username_2**: @username_1 The second part of the OP's question isn't answered in the suggested duplicate. Maybe an edit to eliminate the first part and point toward the duplicate, while leaving the second part open.  

---

## 2 answers

### Answer by username_4 on 2015-06-30. Score: 12 | Accepted answer

Collateral damage says:

> As an additional cost to **cast** Collateral Damage ...

Comprehensive Rule 706.10 says:

> To copy a spell ... means to put a copy of it onto the stack; **a copy of a spell isn’t cast**. ...

Per 706.10, the copy of Collateral Damage isn't cast, so you don't have to pay the cost again.

Copying a spell does not trigger Prowess. Prowess triggers when you cast a spell, and, as we previously discovered, copied spells are not cast. A ruling on [Howl of the Horde](https://gatherer.wizards.com/Pages/Card/Details.aspx?name=Howl%20of%20the%20Horde) reiterates what we have concluded:

> ... Each copy is created on the stack, so it’s not “cast.” Abilities that trigger when a player casts a spell won’t trigger. ...

Some cards actually copy the card (not the spell) and have you cast the copied card. [Panoptic Mirror](https://gatherer.wizards.com/Pages/Card/Details.aspx?name=Panoptic%20Mirror) is a good example. Just to be clear, this would trigger Prowess.

> **Comments:**
> **username_5**: Note that some effects that seem like they are "copying spells" *do* actually cast. In the case of Isochron Scepter and Panoptic Mirror, a *card* is copied and then the copy is cast. (since you can't "copy" a card from exile onto the stack)  
> **username_4**: @username_5 That is an interesting note, so I included it.  

---

### Answer by username_3 on 2015-06-30. Score: 4

From the card rulings:

> 9/20/2014: [...] Each copy is created on the stack, so it's not "cast". Abilities that trigger when a player casts a spell won't trigger.

Since the copy isn't "cast", you don't have to pay attention to any abilities saying "as an additional cost to cast [card]...". This also means that prowess does not trigger.


---

