She's one of the big bad monsters of the format, and whenever she hits the battlefield it immediately becomes less a four-way game and more of a three-on-one
Agent offers more consistent returns on the cascade and is less restrictive on your construction than Bloodbraid

Abyssal Gorestalker Abyssal Harvester Abzan Devotee Aclazotz, Deepest Betrayal Acolyte of Aclazotz Adorned Crocodile Adventurous Eater Agate-Blade Assassin Agency Coroner Agent Venom Agents of HYDRA Aggressive Negotiations Aggressive Symbiosis Ahriman Al Bhed Salvagers Alchemist's Assistant Alesha's Legacy Alien Symbiosis Alley Assailant Alpharael, Stonechosen Ambush Gigapede Anchovy & Banana Pizza Ancient Vendetta Another Chance Appendage Amalgam Arbiter of Woe Arcane Omens Archenemy's Charm Ardyn, the Usurper Armaggon, Future Shark Arnim Zola, Bio-Fanatic Arnyn, Deathbloom Botanist Ashiok's Reaper Ashiok, Wicked Manipulator Auntie's Sentence Avenger of the Fallen Azula Always Lies Azula, On the Hunt Back for Seconds Back on Track Bake into a Pie Balemurk Leech Bandit's Talent Bane-Marked Leonin Barbed Bloodletter Barbed Servitor Baron Helmut Zemo Baron Strucker, HYDRA Overlord Barrow Naughty Basilica Stalker Beamsaw Prospector Bebop, Warthog Warrior Beetle-Headed Merchants Behold the Sinister Six

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The new ultimatums are far more on the Cruel and Violent end of the spectrum than the Clarion and Brilliant end, and the one I'm going to show you today is sure to end a lot of games the same way Cruel and Violent didwith your opponent totally devastated
Most card draw you want to keep for yourself, but if it's down to the last few cards in an opponent's library, targeting a player with Mathemagics to draw before their draw step can give them no choice other than to take the L