As you can imagine, playing an action for free can be incredibly advantageous
Discarding the card triggers Sheriff, who deals damage to an opposing character, which in turn re-readies our Beast
For example, if you cast Flametongue Kavu, deal damage with its enters-the-battlefield ability, exile and return it to the battlefield with Momentary Blink, deal damage again, then cast Momentary Blink with flashback on Flametongue Kavu to repeat the process one more time, you've fulfilled Case of the Burning Masks's "to solve" trigger condition
The original Legends artwork from Mark Tedin is a classic, however it sports no foil version
It gives a unique look to the most recognisable Pokmon, which makes it highly prized by collectors
His On Play effect KOs a 0-cost Character, so technically he can KO a 5-cost Character when played