I did run afoul of a Delina infinite engine once or twice in Limited so far. However, in today's design article, Maro reiterated that the dive mechanics were built for Limited, and to specifically not work in Constructed formats. Time will tell if they succeed, I suppose.Delina begs to differ, with luck or cunning she can be easily the most powerful creature card in the set, playing with her on Arena, even without enhancers, but alot of luck, she has single handedly beaten players for me. Even rolling a 1 and using her own power on herself can deal 6 damage.
I'm still working on my collection in Arena, though I do have a fully functional Cleric Class deck (which, yes, is also Cleric Tribal). It is a solid core for a heal/buff engine in Standaed constructed.