The singer 3 ability is quite strong, and a similar card (Ariel) had a lot of success in The First Chapter format of Disney Lorcana
Cards to Play Around Matchup: Blue-Red Delver Blue-Red Delver: Mainboard 1-2 Brazen Borrower 3-4 Daze Blue-Red Delver: Sideboard 1-2 Force of Negation (2 in 75) 0-2 Counterbalance 0-1 Flusterstorm How To Sideboard vs
We'll be going over Black and Multicolored cards from Throne of Eldraine and boy do we have some powerful and fun cards
Remarkably, there is a confirmed sale of this card for over $500, and that's where its market value started out, but it has since crashed all the way to $104, and based on more recent sales for under $100, it could fall further still
Expect to see this on swarms of zombie tokens that can be made for cheaper than the typical rate and in greater quantities
If the target creature is an illegal target as Y'shtola Rhul's ability tries to resolve, it won't resolve and none of its effects will happen