Vertical cycles can be more difficult to identify, and sometimes may feel completely unrelated from each other
But there have been some complaints from the player base of complexity creep, partially stemming from DFCs
Looking past those few cards, turtle decks can dip into generic typal staples like Roaming Throne, Chronicle of Victory, and Reflections of Littjara that ask you to pick a creature type and reward you for playing it
The sideboard is a good mix of traditional sideboard cards like discard, removal, planeswalkers, Sagas, and Arguels Blood Fast, as well as more toolbox creatures
(Create an Incubator token with four +1/+1 counters on it and "2: Transform this artifact." It transforms into a 0/0 Phyrexian artifact creature.) Phyrexians you control have vigilance
I also like some of the new ones from Unfinity like Night Shift of the Living Dead and Vedalken Squirrel-Whacker