The total cost to cast a spell is locked in before you pay that cost. For example, if you control three creature tokens, including one you can sacrifice to add {C}, the total cost to cast an instant with mana cost {4}{R} is {1}{R}. Then you can sacrifice the creature when you activate mana abilities just before paying the cost.
Activating a permanent card's unearth ability isn't the same as casting it as a spell. The unearth ability is put on the stack, but the card is not. Spells and abilities that interact with activated abilities (such as Stifle) will interact with unearth, but spells and abilities that interact with spells (such as Cancel) will not.
If you activate a card's unearth ability but that card is removed from your graveyard before the ability resolves, that unearth ability will resolve and do nothing.
Last observed on Scryfall 2 months ago at $41.06. Over the trailing 90 days the price moved between $30.40 and $41.06 across 52 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 2 catalogued treatments from 40K — the lineup includes Foil 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 #131★ of *Warhammer 40,000 Commander*, the set that shipped alongside the October 2022 Warhammer 40,000 Commander release.
Card type: Legendary Creature — Demon Primarch, color identity red/blue, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {3}{U}{R} (5 converted). Keyword abilities: Flying, Blade of Magnus, and Unearthly Power.
Legal in Legacy, Vintage, and Commander.
EDHrec ranks this card #5,998 in Commander, putting it in the niche-pick tier of the format's playable pool.
Illustrated by Wonchun Choi. Rarix catalogs 33 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Wonchun Choi
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
Unearth grants haste to the permanent that's returned to the battlefield. However, neither of the "exile" abilities is granted to that permanent. If that creature loses all its abilities, it will still be exiled at the beginning of the end step, and if it would leave the battlefield, it is still exiled instead.
If a permanent returned to the battlefield by an unearth ability would leave it for any reason, it's exiled instead—unless the spell or ability that's causing it to leave the battlefield is actually trying to exile it. In that case, the spell or ability succeeds at exiling the permanent. If the spell or ability later returns the card to the battlefield, it will return as a new object with no relation to its previous existence. The unearth effect will no longer apply to it.
At the beginning of the end step, a permanent returned to the battlefield with unearth is exiled. This is a delayed triggered ability, and it can be countered by effects that counter triggered abilities. If the ability is countered, the permanent will stay on the battlefield and the delayed trigger won't trigger again. However, the replacement effect will still exile it if it eventually leaves the battlefield.
