It's pretty easy to ascend in Commander, and you should almost always have the city's blessing by the time it makes it back to your turn
Blood Pact Brace for Impact Case of the Shattered Pact Damnable Pact Darkpact Deathpact Angel Demonic Pact Eldritch Pact Enemy of the Guildpact Explosive Impact Falco Spara, Pactweaver Festival of the Guildpact Frenemy of the Guildpact (playtest) Glaive of the Guildpact Glass of the Guildpact Grave Pact Guardian of the Guildpact Guildpact Informant Guildpact Paragon Gutmorn, Pactbound Servant Impact Resonance Impact Tremors Intervention Pact Jace, the Living Guildpact Leyline of the Guildpact Molten Impact Niv-Mizzet, Guildpact Pact Weapon Pact of Negation Pact of the Serpent Pact of the Titan Pactdoll Terror Scrap Compactor Seal of the Guildpact Seedship Impact Slaughter Pact Sphinx of the Guildpact Sudden Impact Summoner's Pact Tainted Pact Terrapact Intimidator Tome of the Guildpact Unhallowed Pact Violent Impact Wicked Pact Xander's Pact

Her ultimate is a classic game-ender, and can even be used immediately if you pay full price, making it a refreshing change from the planeswalker norm
If any damage would be dealt to him, The Betrayer prevents that damage and you choose an opponent to gain control of him
There are definitely times when it'll be your all-star card, but I can also imagine cutting it from the deck that's not got many instants