Nyarla was used to Xyz Summon Outer Entity Azathot whose effect prevents Shao-Jun from activating any monster effects for the turn, essentially rendering any hand traps that Shao-Jun may have drawn from Maxx C useless
No, though you direct your attackers to a specific player, attacking does not target, and thus is not a crime
You can cast it for four mana, and then activate it for one mana and tap it to destroy all Artifacts, Creatures, and Enchantments
By retrieving it again once it's sent to the Graveyard, you aim to maintain your board by bringing out Shaddolls every turn
Priced at over $94, its not quite in that $10 range, but its still something people will be happy to pick up cheaper (even if their opponents arent happy about it!)
Sun & Moon sets which were released from 2017-2019 featured a repeating type symbol pattern, with a larger symbol in the bottom left of the card