Chrome Host Seedshark — ruling 1

If the noncreature spell has {X} in its mana cost, use the value chosen for X when calculating that spell's mana value.

Chrome Host Seedshark : règles, fonctionnement et interactions (MTG)

Chrome Host Seedshark 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

Flying Whenever you cast a noncreature spell, incubate X, where X is that spell's mana value. (Create an Incubator token with X +1/+1 counters on it and ": Transform this token." It transforms into a 0/0 Phyrexian artifact creature.)

How it works : Chrome Host Seedshark

Original English text — Wizards of the Coast / Scryfall

#1April 14, 2023· Wizards of the Coast
If the noncreature spell has in its mana cost, use the value chosen for X when calculating that spell's mana value.
No other card is named in this ruling.