At the time of Nadu's banning, head designer Mark Rosewater identified that a big problem was zero-cost activations, and said they were something Wizards had "stopped doing"
Speaking of other cards you can include, Traptrix Dionaea, another main deck one that either summons a Traptrix from grave in defense when shes normal summoned or when shes special summoned lets us reset a normal trap from our grave, but we banish it at our next end phase
I eventually quit because of the predatory pricing model
They can't be the target of spells or abilities, their static abilities have no effect on the game, their triggered abilities can't trigger, they can't attack or block, and so on
Maybe it was too early to tell, but having prowess or power matters if they want to keep it in gruul would be the decision I would have made