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Magic becomes more of a game about accounting and resource management with each passing year and thats something Atraxa, Praetors Voice interacts with very well
While it could use some protection (enter Temple Altisaur), being able to discover X once per turn based on the toughness of a Dino entering the battlefield is a huge play, and one that can snowball into an easy victory if your deck is stacked the right way
Horobi, Deaths Wail Creatures dont last long when Horobi, Death's Wail is on the battlefield
Search for a Card Then Exile It Cards such as Bitter Ordeal , Praetors Grasp and Sadistic Sacrament are top notch as they let you search an opponents deck for any card/s and exile it/them without having to name the card/s beforehand
If you have several possible ways to Sacrifice a creature, only one takes effect