WotC denied this, saying, "This art was created by humans and not AI." Rapoza also replied to this statement before confirming that he had quit
Unless you play one for the channel effect, of course
Some stores will have more competitive players and might give out prizing differently
Focusing on frogs cuts into the number of slots you have for enchantments, but you get to run bigger threats like Yargle and Multani to have more and better targets for your limited auras
At the top end, you have Spined Tyrranax, which only costs you five mana, tied with Slinza in cost
These effects are combined with a number of powerful synergies that trigger when you sacrifice a creature or can help generate value when combined with your sacrifice effects including Elas (drain your opponents) as well as Phyrexian Missionary (can return a creature from graveyard to your hand), Phyrexian Warhorse (creatures creature tokens as a target to sacrifice), Braid's Frightful Return (returns a creature to your hand from the graveyard), as well as Writhing Necromass which is a strong body and can be cast way ahead of curve as you sacrifice creatures