AI DraftFeb 26, 2026
Displacer Kitten + Mox Amber + Teferi, Time Raveler
Overview
Teferi, Time Raveler’s static ability prevents your opponent (the controller of Displacer Kitten + Mox Amber in that scenario) from casting spells except any time they could cast a sorcery, and that restriction takes precedence over any permission to cast at instant speed [Ruling 2024-01-12]. Mox Amber’s mana ability only produces mana if its controller controls at least one legendary creature or planeswalker at the time it’s activated [Ruling 2018-04-27]. Displacer Kitten’s triggered ability triggers when you cast a noncreature spell and, when it resolves, exiles and then returns the chosen permanent as a new object with no connection to the previous object [Ruling 2022-06-10]. The Kitten trigger resolves after the spell has been cast (so it cannot retroactively pay for that spell); mana abilities used to pay a spell’s costs must be activated during the casting step before paying costs .
Step 1
You attempt to cast a noncreature spell. Whether you may cast it at that time is governed by timing restrictions; if an opponent controls Teferi, Time Raveler, its static ability prevents you from casting spells except any time you could cast a sorcery [Ruling 2024-01-12].
Step 2
During the casting process, before paying costs, you may activate mana abilities (for example Mox Amber’s 
ability) if doing so will help pay the spell’s cost .
ability) if doing so will help pay the spell’s cost .Step 3
Mox Amber’s ability will add mana only if, at the time you activate it, you control at least one legendary creature or planeswalker; if you do not, activating the ability produces no mana [Ruling 2018-04-27].
Step 4
Once the casting step (601.2a–h) completes, the spell is cast and the stack now contains the noncreature spell . That casting causes Displacer Kitten’s triggered ability (“Whenever you cast a noncreature spell…”) to trigger and be put on the stack.
Step 5
The Displacer Kitten triggered ability resolves after it is on the stack; its resolution exiles up to one target nonland permanent you control and then returns that card to the battlefield, and the returned object is a new object with no connection to the previous one [Ruling 2022-06-10].
Step 6
Because the Kitten trigger resolves after the spell was cast, exiling and returning Mox Amber at that time cannot retroactively produce mana to pay for the already-cast spell; mana to pay a spell’s cost must be produced during the casting process before costs are paid and the Kitten trigger resolves later .
Step 7
If Mox Amber is exiled and returns, it returns as a new object and will be subject to ordinary checks at the time you later try to activate it (for example, you must then control a legendary creature or planeswalker for it to add mana) [Ruling 2022-06-10] and [Ruling 2018-04-27].
Resolution
If an opponent controls Teferi, Time Raveler, you cannot cast spells except at sorcery timing, and that prohibition overrides any permission to cast at instant speed [Ruling 2024-01-12]. Mox Amber will only add mana if you (the Mox Amber’s controller) control a legendary creature or planeswalker when you activate it [Ruling 2018-04-27]. Displacer Kitten’s exile-and-return effect makes the returned permanent a new object with no memory of the previous object, so exiling and returning Mox Amber via the Kitten trigger does not retroactively produce mana for a spell you already cast and cannot change whether that already-cast spell was legal to cast at that time [Ruling 2022-06-10] and .
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