Splinter, the Mentor

Card text

Menace

Whenever Splinter or another nontoken creature you control leaves the battlefield, create a Mutagen token.

Partner-Character select (You can have two commanders if both have this ability.)

"We choose what holds us back."

Market price

Latest aggregated market price for the normal finish of this printing: $2.04 (as of 2026-11-02).

The figure covers this printing only; other printings carry their own price on their own page.

Format legality

Legality of Splinter, the Mentor by format. Formats in which it is not legal are not listed.

Other printings of Splinter, the Mentor

The other printings are listed newest first, with the rarity and release year of each.

Official rulings

The 8 most recent official rulings for Splinter, the Mentor, newest first.

• 2026-01-27 Once the game begins, your two commanders are tracked separately. If you cast one, you won't have to pay an additional {2} the first time you cast the other. A player loses the game after having been dealt 21 damage from any one of them, not from both of them combined.
• 2026-01-27 An effect that checks whether you control your commander is satisfied if you control one or both of your two commanders.
• 2026-01-27 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 Donatello, the Brains and Splinter, the Mentor are your commanders, your deck may contain cards with blue and/or black in their color identity, but not cards with red, green, or white. (If Leonardo, the Balance is one of your commanders, your deck may contain cards with any color or combination of colors in their color identity, regardless of who your other commander is.)
• 2026-01-27 Some spells and abilities that create Mutagen tokens require targets. If each target chosen is an illegal target as that spell or ability tries to resolve, it won't resolve. The Mutagen token won't be created.
• 2026-01-27 You can have two commanders if each one has "Partner-Character select." You can't mix and match them with cards that have other partner abilities.
• 2026-01-27 Mutagen tokens are a kind of predefined token. Each one is a colorless artifact with the artifact subtype Mutagen and the ability "{1}, {T}, Sacrifice this token: Put a +1/+1 counter on target creature. Activate only as a sorcery."
• 2026-01-27 Both commanders start in the command zone, and the remaining 98 cards of your deck are shuffled to become your library.
• 2026-01-27 To have two commanders, both must have appropriate partner abilities as the game begins. Losing the ability during the game doesn't cause either to cease to be your commander.

Similar cards

Other creature cards with a black colour identity, ranked by how often they appear in Commander decks.

• Blood Artist
• Pitiless Plunderer
• Mirkwood Bats
• Zulaport Cutthroat
• Gray Merchant of Asphodel