The strong stats and power to cycle back into your hand makes Marshmallow a fantastic challenger, and a pain for your opponents to get rid of permanently - theyll need to have some form of removal effect in their hand, as challenges wont cut it alone
Turtwig, Chimchar, and Piplup
Chainer, Nightmare Adept Haste is one of the most underrated keywords in all of Magic
As long as you hit with a big dragon or find a source to deal enough noncombat damage for the backgrounds trigger, then you get a Dragon token on each of your end steps
(If a creature with a finality counter on it would die, exile it instead.) Enchantment Haunted One Commander creatures you own have "Whenever this creature becomes tapped, it and other creatures you control that share a creature type with it each get +2/+0 and gain undying until end of turn." (When a creature with undying dies, if it had no +1/+1 counters on it, return it to the battlefield under its owner's control with a +1/+1 counter on it.) Legendary Enchantment - Background Radiant Destiny Ascend (If you control ten or more permanents, you get the city's blessing for the rest of the game.) As this enchantment enters, choose a creature type