I do like Sheoldred, Whispering One, Knollspine Dragon and Balefire Dragon
Its exactly the same effect as blink, (named for the Time Spiral card Momentary Blink (although Momentary Blink only targeted Creatures, while Flicker hit nontoken permanents
Put together, this is a format where you can curve creatures, generate light value, remove a thing that matters, and win
This version does a good job of telling the specific story of the Minstrel creating higher difficulty fights, but it doesn't reward you for putting Towns in your deck unless you can afford to invest five mana, which often won't be the case in Standard
The nonlegendary condition and a -1/-1 counter are drawbacks, but there are plenty of solid targets in your deck, Im sure
Characters like Tigger, Baymax, and Tiana bring powerful effects and abilities that can shape gameplay