Green is an excellent color to splash into this archetype: Green and black represent death and regrowth, synergizing to reward you for sacrificing your own creatures
Yshtola, Nights Blessed
Gogo, Master of MimicryGogo, Master of Mimicry Gogo, Master of MimicryGogo, Master of Mimicry's ability to copy activated or triggered abilities you control X times is exactly the sort of thing combo fans are going to be thrilled to explore when building their Gogo decks
If you mean 'challenging' other characters, or glimmers, in play Steel and Ruby are good at challenging and can get benefits for banishing opposing characters during challenges
When she is banished from play, she becomes a resource for you instead of going to the discard pile she is always with you
The rules for Disney Lorcana fit on a single sheet of paper, a copy of which you can find inside the box that came with your starter deck