Kozilek's triggered ability checks to see if you have fewer than seven cards in hand when you cast it. Kozilek is on the stack at this time and not in your hand. If you don't, the ability won't trigger at all. If the ability does trigger, it will check again as it tries to resolve. If you have seven or more cards in hand at that time, the ability won't do anything.
If there's an {X} in the mana cost of the card you discard, that X is 0. Any {X} in the mana cost of the target spell will have whatever value was determined for it as the spell was cast.
The mana value of a spell doesn't change, even if it's been cast using an alternative cost (such as an awaken cost). For example, the mana value of a Sheer Drop (a spell with mana cost {2}{W}) that's been cast for its awaken cost of {5}{W} is 3.
Last observed on Scryfall 2 months ago at $11.17. Over the trailing 90 days the price moved between $0.02 and $11.45 across 45 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from OGW — the lineup includes Foil and Nonfoil alongside the standard finish. Across our catalog the Rarix library tracks every variant in the same family so collectors can compare price, scarcity and demand inside a single lineage.
Card #4 of *Oath of the Gatewatch*, the set that shipped alongside the January 2016 Oath of the Gatewatch release.
Card type: Legendary Creature — Eldrazi, printed at mythic. Mythic rares historically land in roughly one out of every eight boosters at standard print densities. Mana cost: {8}{C}{C} (10 converted). Keyword abilities: Menace.
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #1,492 in Commander, putting it in the common-include tier of the format's playable pool.
Illustrated by Aleksi Briclot. Rarix catalogs 479 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Aleksi Briclot
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
To activate the last ability, there must be a legal target: a spell on the stack. That target will determine the value of X and the mana value of the card you discard. You can't activate the ability unless you can match the mana value of a spell on the stack to that of a card in your hand.
