If you control ten permanents but don't control a permanent or resolving spell with ascend, you don't get the city's blessing. For example, if you control ten permanents, lose control of one, then cast Golden Demise, you won't have the city's blessing and the spell will affect creatures you control.
A permanent is any object on the battlefield, including tokens and lands. Spells and emblems aren't permanents.
If you cast a spell with ascend, you don't get the city's blessing until it resolves. Players may respond to that spell by trying to change whether you get the city's blessing.
Last observed on Scryfall 2 months ago at $3.51. Over the trailing 90 days the price moved between $0.02 and $3.79 across 54 observations. Cross-checked across TCGplayer, eBay sold, Cardmarket EU, and Star City.
This printing is one of 3 catalogued treatments from RIX — 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 #150 of *Rivals of Ixalan*, the set that shipped alongside the January 2018 Rivals of Ixalan release.
Card type: Creature — Dinosaur, color identity green, printed at rare. Rares occupy the bottom-of-pack rare slot in standard boosters. Mana cost: {2}{G} (3 converted). Keyword abilities: Ascend.
Legal across the major constructed formats — Modern, Legacy, Vintage, and Commander — plus Standard rotation play.
EDHrec ranks this card #954 in Commander, putting it in the common-include tier of the format's playable pool.
Illustrated by Chris Rahn. Rarix catalogs 1,209 other cards credited to this artist.
Magic: The Gathering · ™ & © Wizards of the Coast · Illus. Chris Rahn
Card data via Scryfall. Rarix is fan-made; not endorsed by the rights holders.
If your tenth permanent enters the battlefield and then a permanent leaves the battlefield immediately afterwards (most likely due to the "Legend Rule" or due to being a creature with 0 toughness), you get the city's blessing before it leaves the battlefield.
Wayward Swordtooth's middle ability is cumulative if you control more than one. It's also cumulative with other effects that let you play additional lands, such as the one from Enter the Unknown.
Once you have the city's blessing, you have it for the rest of the game, even if you lose control of some or all of your permanents. The city's blessing isn't a permanent itself and can't be removed by any effect.
Ascend on a permanent isn't a triggered ability and doesn't use the stack. Players can respond to a spell that will give you your tenth permanent, but they can't respond to getting the city's blessing once you control that tenth permanent. This means that if your tenth permanent is a land you play, players can't respond before you get the city's blessing.
