If you cast a spell for another cost "rather than pay its mana cost," you can't choose to cast it for any alternative costs. You can, however, pay additional costs. If the card has any mandatory additional costs, such as that of Spark Harvest, those must be paid to cast the card.
Bolas's Citadel may be one of the permanents you sacrifice to activate its last ability.
You must follow the normal timing permissions and restrictions of the cards you play from your library.
Last observed on Scryfall 2 months ago at $45.57. Over the trailing 90 days the price moved between $7.44 and $45.57 across 45 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from PWAR — 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 #79p of *War of the Spark Promos*, the promotional run that shipped alongside the May 2019 War of the Spark release.
Card type: Legendary Artifact, color identity black, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {3}{B}{B}{B} (6 converted).
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #262 in Commander, putting it in the popular-include tier of the format's playable pool.
Illustrated by Jonas De Ro. Rarix catalogs 775 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Jonas De Ro
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
Bolas's Citadel lets you look at the top card of your library whenever you want (with one restriction—see below), even if you don't have priority. This action doesn't use the stack. Knowing what that card is becomes part of the information you have access to, just like you can look at the cards in your hand.
If a spell has {X} in its mana cost, you must choose 0 as the value of X when casting it without paying its mana cost.
You can play a land card from the top of your library only if you have available land plays remaining.
If the top card of your library changes while you're casting a spell, playing a land, or activating an ability, you can't look at the new top card until you finish doing so. This means that if you cast the top card of your library, you can't look at the next one until you're done paying for that spell.
In a Two-Headed Giant game, the last ability of Bolas's Citadel causes the opposing team to lose 20 life.
