Youve got to jump through some hoops to get the payoff get a creature worth animating into your graveyard, get Slimefoot and Squee from your command zone into the graveyard, have a Saproling on the battlefield, have four mana to activate Slimefoot and Squee from the graveyard at sorcery speed, and boompayoff
If the ground gets mucked up, it gets around needing the combat step to deal damage
That was released earlier today, and you can find everything you need to know about it here
The Omen Cycle In terms of what they were capable of, the cycle of enchantments in Theros Beyond Death may be more powerful than many of the enchantments early Magic, while still being common
Urabrask, the red praetor, doesn't cooperate with the others, so he wasn't involved in the process