Dragons of Tarkir was the dragon set, but unlike Fate Reforged, it had zero dragons at common (though it did have an as-fan over 1 thanks to the preponderance of uncommon dragons)
Terra's abilities also synergize well with the Esper cards, so it's clear Magic 's designers are encouraging this build
The nice thing with Maze of Ith is that you can use it to untap your own creatures, like those with an attack trigger, so you can get whatever activation you want and keep your creature out of harms way
Adventures in the Forgotten Realms, Strixhaven: School of Mages, and Theros Beyond Death all have good haste cards
Meanwhile, Elsa has three abilities that make her a scary and impressive force on the field, particularly when she enters play, as she can challenge immediately and exert an opponent in order to do just that
Now think about paying seven life for 7/7s, a kill within three turns, or even 10/10s to kill with just two hits