Green commanders that reward you for hitting an opponent like Fynn, the Fangbearer, Sakiko, Mother of Summer, and Toski, Bearer of Secrets are big fans of this
(Then shuffle this card into its owner's library.) If the target creature's power becomes greater than 3 before Petty Revenge resolves, the target is illegal and the spell is put into its owner's graveyard
While Mangaras first ability may not trigger too often (lifelink on a creature with four toughness makes for an unproductive combat step), playing multiple spells each turn in Commander is a forgone conclusion
Is it priced the same
The collaboration set is a substantial release, featuring over 300 cards that will be legal for play in MTGs Standard format
For me, Varina falls into the third commander problem where she no longer helps the theme at all but is instead tossed in as a bonus