Toothy, Imaginary Friend — ruling 1

If a spell or ability causes you to put cards in your hand without specifically using the word "draw," Toothy's middle ability won't trigger.

Toothy, Imaginary Friend — ruling 2

If you draw multiple cards, Toothy's middle ability triggers that many times. If your team also controls Pir, each of those resolving triggered abilities puts two +1/+1 counters on Toothy.

Toothy, Imaginary Friend — ruling 3

If enough -1/-1 counters are put on Toothy at the same time to make its toughness 0 or less, the number of +1/+1 counters on it before it got any -1/-1 counters will be used to determine how many cards you draw. For example, if there are two +1/+1 counters on Toothy and it gets three -1/-1 counters, you'll draw two cards.

Toothy, Imaginary Friend — ruling 4

"Partner with [name]" represents two abilities. The first is a triggered ability: "When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle their library."

Toothy, Imaginary Friend — ruling 5

Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text.

Toothy, Imaginary Friend — ruling 6

The second ability represented by the "partner with [name]" keyword modifies the rules for deck construction in the Commander variant and has no function outside of that variant. If a legendary creature card with "partner with [name]" is designated as your commander, the named legendary creature card can also be designated as your commander. For more information on the Commander variant, please visit Wizards.com/Commander.

Toothy, Imaginary Friend — ruling 7

If your Commander deck has two commanders, you can only include cards whose own color identities are also found in your commanders' combined color identities. If Khorvath and Sylvia are your commanders, your deck may contain cards with red and/or white in their color identity, but not blue, black, or green.

Toothy, Imaginary Friend — ruling 8

Both commanders start in the command zone, and the remaining 98 cards of your deck are shuffled to become your library.

Toothy, Imaginary Friend : règles, fonctionnement et interactions (MTG)

Toothy, Imaginary Friend is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Partner with Pir, Imaginative Rascal (When this creature enters, target player may put Pir into their hand from their library, then shuffle.) Whenever you draw a card, put a +1/+1 counter on Toothy. When Toothy leaves the battlefield, draw a card for each +1/+1 counter on it.

How it works : Toothy, Imaginary Friend

Original English text — Wizards of the Coast / Scryfall

#1June 8, 2018· Wizards of the Coast
If a spell or ability causes you to put cards in your hand without specifically using the word "draw," Toothy's middle ability won't trigger.
No other card is named in this ruling.
#2June 8, 2018· Wizards of the Coast
If you draw multiple cards, Toothy's middle ability triggers that many times. If your team also controls Pir, each of those resolving triggered abilities puts two +1/+1 counters on Toothy.
No other card is named in this ruling.
#3June 8, 2018· Wizards of the Coast
If enough -1/-1 counters are put on Toothy at the same time to make its toughness 0 or less, the number of +1/+1 counters on it before it got any -1/-1 counters will be used to determine how many cards you draw. For example, if there are two +1/+1 counters on Toothy and it gets three -1/-1 counters, you'll draw two cards.
No other card is named in this ruling.
#4June 8, 2018· Wizards of the Coast
"Partner with [name]" represents two abilities. The first is a triggered ability: "When this permanent enters the battlefield, target player may search their library for a card named [name], reveal it, put it into their hand, then shuffle their library."
No other card is named in this ruling.
#5June 8, 2018· Wizards of the Coast
Note that the target player searches their library (which may be affected by effects such as that of Stranglehold) and that the card they find is revealed, even though these words aren't included in the ability's reminder text.
No other card is named in this ruling.
#6June 8, 2018· Wizards of the Coast
The second ability represented by the "partner with [name]" keyword modifies the rules for deck construction in the Commander variant and has no function outside of that variant. If a legendary creature card with "partner with [name]" is designated as your commander, the named legendary creature card can also be designated as your commander. For more information on the Commander variant, please visit Wizards.com/Commander.
No other card is named in this ruling.
#7June 8, 2018· Wizards of the Coast
If your Commander deck has two commanders, you can only include cards whose own color identities are also found in your commanders' combined color identities. If Khorvath and Sylvia are your commanders, your deck may contain cards with red and/or white in their color identity, but not blue, black, or green.
No other card is named in this ruling.
#8June 8, 2018· Wizards of the Coast
Both commanders start in the command zone, and the remaining 98 cards of your deck are shuffled to become your library.
No other card is named in this ruling.
#9June 8, 2018· Wizards of the Coast
To have two commanders, both must have the partner ability (featured in the Magic: The Gathering—Commander™ (2016 Edition) set) or corresponding "partner with" abilities as the game begins. A creature with a "partner with" ability can't partner with any creature other than its designated partner. Losing a partner ability during the game doesn't cause either to cease to be your commander.
No other card is named in this ruling.
#10June 8, 2018· Wizards of the Coast
Once the game begins, your two commanders are tracked separately. If you cast one, you won't have to pay an additional the first time you cast the other. A player loses the game after having been dealt 21 damage from one of them, not from both of them combined. Command Beacon's effect puts one into your hand from the command zone, not both.
No other card is named in this ruling.
#11June 8, 2018· Wizards of the Coast
An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.
No other card is named in this ruling.
#12June 8, 2018· Wizards of the Coast
The triggered ability of the "partner with" keyword still triggers in a Commander game. If your other commander has somehow ended up in your library, you can find it. You can also target another player who might have that card in their library.
No other card is named in this ruling.

Popular combos

Real combos played by the community, sorted by popularity.

#1
O'aka, Traveling Merchant + Mind Over Matter + Toothy, Imaginary Friend
Infinite self-discard triggersInfinite draw triggersInfinite looting
1Activate O'aka by tapping it and removing a counter from a nonland permanent, causing you to draw a card.
2Toothy triggers, putting a counter on it.
3Activate Mind Over Matter by discarding a card, untapping O'aka.
4Repeat.

#1
O'aka, Traveling Merchant + Mind Over Matter + Toothy, Imaginary Friend
Infinite self-discard triggersInfinite draw triggersInfinite looting
1Activate O'aka by tapping it and removing a counter from a nonland permanent, causing you to draw a card.
2Toothy triggers, putting a counter on it.
3Activate Mind Over Matter by discarding a card, untapping O'aka.
4Repeat.

#2
Falco Spara, Pactweaver + Sensei's Divining Top + Cloud Key + Toothy, Imaginary Friend
Near-infinite artifact ETBNear-infinite artifact LTBInfinite card drawInfinite draw triggers
1Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library.
2Toothy triggers, putting a +1/+1 counter on it.
3Cast Sensei's Divining Top from the top of your library by paying and removing a counter from a creature you control.
4Repeat.

#2
Falco Spara, Pactweaver + Sensei's Divining Top + Cloud Key + Toothy, Imaginary Friend
Near-infinite artifact ETBNear-infinite artifact LTBInfinite card drawInfinite draw triggers
1Activate Sensei's Divining Top's second ability by tapping it, causing you to draw a card and put Sensei's Divining Top on top of your library.
2Toothy triggers, putting a +1/+1 counter on it.
3Cast Sensei's Divining Top from the top of your library by paying and removing a counter from a creature you control.
4Repeat.

Interactions with other cards

These cards' text mentions Toothy, Imaginary Friend.

Pir, Imaginative Rascal

Partner with Toothy, Imaginary Friend (When this creature enters, target player may put Toothy into their hand from their library, then shuffle.) If one or more counters would be put on a permanent your team controls, that many plus one of each of those kinds of counters are put on that permanent instead.