<p>You may cast an instant spell to end the loop as you describe.</p>

<p>You may activate an ability to end the loop as you describe.</p>

<p>But you may not cast a creature spell (unless it has Flash).</p>

<hr>

<p>The following is the loop in detail:</p>

<ol>
<li>[You play a Forest or something]

<ol>
<li>Sporemound's ability triggers.</li>
</ol></li>
<li>You place Sporemound's ability on the stack.</li>
<li>Player's get priority.</li>
<li>Sporemound's ability resolves.

<ol>
<li>You create a 1/1 green Saproling creature token that enters as a 1/1 green Forest Saproling land creature token.

<ol>
<li>Sporemound's ability triggers.</li>
</ol></li>
</ol></li>
<li>Goto 2.</li>
</ol>

<p>In step 3, you get to cast a spell or activate an ability in response to Sporemound's triggered ability. These will resolve before step 4 (because the last thing added to the stack resolves first). Step 4 will still happen (since the ability was added to the stack in step 2), but step 5 won't happen if Sporemound's ability doesn't trigger (e.g. because it's not there, or because the created Saproling didn't enter as a land), thus breaking the loop.</p>

<p>Note that the stack isn't empty in step 3, so the only spells you can cast are instant spells and spells with Flash, so casting <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bAcidic%20Slime%5d">Acidic Slime</a> is out. Activated abilities of creatures are fine, though, so activating <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bGobbling%20Ooze%5d">Gobbling Ooze</a> is possible.</p>

CC BY-SA 4.0
2019-03-15T03:57:18.853Z
Oops, you can't cast Acidic Slime. See updated answer.
ikegami
CC BY-SA 4.0
2019-03-15T03:31:20.970Z
2019-03-15T04:00:23.347Z
2019-03-15T04:00:23.347Z
ikegami
<p>Can I respond to my own triggered infinite loop with <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bSporemound%5d">Sporemound</a> and <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bLife%20and%20Limb%5d">Life and Limb</a> by casting <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bAcidic%20Slime%5d">Acidic Slime</a> to destroy <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bLife%20and%20Limb%5d">Life and Limb</a> or by paying to activate <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bGobbling%20Ooze%5d">Gobbling Ooze</a> ability to destroy <a class="mtg-autocard" target="_blank" rel="noreferrer" href="http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bSporemound%5d">Sporemound</a>?</p>

CC BY-SA 4.0
2019-03-15T06:59:36.893Z
Alternatively, you are entirely allowed to say you won't do anything to stop this, and if your opponent can't stop it either it's a draw. This might be a good idea if, for instance, you have low life total and your opponent has a flying creature you can't do anything about no matter how many saprolings you have.
Arthur
<magic-the-gathering>
Can I respond to my infinite loop by casting a creature spell?
Sonkuragari
# Can I respond to my infinite loop by casting a creature spell?

(Asked by: username_0 on 2019-03-15)

Can I respond to my own triggered infinite loop with [Sporemound](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bSporemound%5d) and [Life and Limb](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bLife%20and%20Limb%5d) by casting [Acidic Slime](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bAcidic%20Slime%5d) to destroy [Life and Limb](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bLife%20and%20Limb%5d) or by paying to activate [Gobbling Ooze](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bGobbling%20Ooze%5d) ability to destroy [Sporemound](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bSporemound%5d)?

**Tags:** magic-the-gathering

> **Comments:**
> **username_1**: Alternatively, you are entirely allowed to say you won't do anything to stop this, and if your opponent can't stop it either it's a draw. This might be a good idea if, for instance, you have low life total and your opponent has a flying creature you can't do anything about no matter how many saprolings you have.  

---

## 1 answers

### Answer by username_2 on 2019-03-15. Score: 14 | Accepted answer

You may cast an instant spell to end the loop as you describe.

You may activate an ability to end the loop as you describe.

But you may not cast a creature spell (unless it has Flash).

---

The following is the loop in detail:

1. [You play a Forest or something]
   1. Sporemound's ability triggers.
2. You place Sporemound's ability on the stack.
3. Player's get priority.
4. Sporemound's ability resolves.
   1. You create a 1/1 green Saproling creature token that enters as a 1/1 green Forest Saproling land creature token.
      1. Sporemound's ability triggers.
5. Goto 2.

In step 3, you get to cast a spell or activate an ability in response to Sporemound's triggered ability. These will resolve before step 4 (because the last thing added to the stack resolves first). Step 4 will still happen (since the ability was added to the stack in step 2), but step 5 won't happen if Sporemound's ability doesn't trigger (e.g. because it's not there, or because the created Saproling didn't enter as a land), thus breaking the loop.

Note that the stack isn't empty in step 3, so the only spells you can cast are instant spells and spells with Flash, so casting [Acidic Slime](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bAcidic%20Slime%5d) is out. Activated abilities of creatures are fine, though, so activating [Gobbling Ooze](http://gatherer.wizards.com/Pages/Search/Default.aspx?name=%2b%5bGobbling%20Ooze%5d) is possible.

> **Comments:**
> **username_2**: Oops, you can't cast Acidic Slime. See updated answer.  

---

