In Tempest, it was turn one (Mogg Fanatics, shadow creatures, and flyers), Invasion turn two (2/2 bears for every possible color combination plus several one- and two-mana apprentices and utility creatures), and Mirage turn three
Creatures represent monsters, heroes, and beings you summon to the battlefield
Urianger Augurelt* When you want a faux-card game in your card game Urianger is there as an option for blue/white exile casting decks and working well with mechanics like Foretell and Plot, though the bonus of 2 life is meager as a payoff
The Balrog of Moria The Balrog of Moria is just a big commander that hits hard and fast
Notably, since Ariel is a Princess character, she can be Exerted to sing a song for free and then Readied again when Moana, Of Motunui Quests
Warbeast of Gorgoroth All you need is two anthems and Warbeast of Gorgoroth goes infinite with Goblin Bombardment