These are at their best in midrange and control decks that dont mind taking the first turn or two off to develop their mana
Ainok SurvivalistAinok Survivalist, Hooded HydraHooded Hydra, and Roshan, Hidden MagisterRoshan, Hidden Magister are a few of the best options
You can guarantee a legendary creature on board for Mox Amber, and a creature to sacrifice for Diabolic Intent, to give just a couple of examples
Yoshimaru, Ever Faithful Yoshimaru, Ever Faithful might have been an even better flavor win if it added loyalty counters to planeswalkers
With the Ursula's Return expansion, this power became especially problematic, and Disney Lorcana is now taking steps to address the problem
For example, The First Doctor was XXX/501, but The Twelfth Doctor was XXX/512