Zimone, Infinite Analyst — ruling 1

If you cast your first spell with {X} in its mana cost during a turn before Zimone is on the battlefield, casting another spell with {X} in its mana cost later in the turn won't cause her last ability to trigger. That spell also won't have the cost reduction from Zimone's first ability.

Zimone, Infinite Analyst — ruling 2

Zimone's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.

Zimone, Infinite Analyst — ruling 3

Since Zimone's last ability won't trigger until you've finished casting your first spell with {X} in its mana cost each turn, the counters from that ability won't be placed on Zimone until after that spell's cost has been determined. The counters put on Zimone from casting your first spell with {X} in its mana cost do not reduce that same spell's cost.

Zimone, Infinite Analyst : règles, fonctionnement et interactions (MTG)

Zimone, Infinite Analyst 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

The first spell you cast with in its mana cost each turn costs less to cast for each +1/+1 counter on Zimone. Whenever you cast your first spell with in its mana cost each turn, put two +1/+1 counters on Zimone.

How it works : Zimone, Infinite Analyst

Original English text — Wizards of the Coast / Scryfall

#1March 20, 2026· Wizards of the Coast
If you cast your first spell with in its mana cost during a turn before Zimone is on the battlefield, casting another spell with in its mana cost later in the turn won't cause her last ability to trigger. That spell also won't have the cost reduction from Zimone's first ability.
No other card is named in this ruling.
#2March 20, 2026· Wizards of the Coast
Zimone's last ability resolves before the spell that caused it to trigger. It resolves even if that spell is countered or otherwise leaves the stack.
No other card is named in this ruling.
#3March 20, 2026· Wizards of the Coast
Since Zimone's last ability won't trigger until you've finished casting your first spell with in its mana cost each turn, the counters from that ability won't be placed on Zimone until after that spell's cost has been determined. The counters put on Zimone from casting your first spell with in its mana cost do not reduce that same spell's cost.
No other card is named in this ruling.