Built a brawl deck around Falco Spara, which reads that you can play cards from the top of your library by removing a counter from a creature you control. Whenever I try to do this, if I have any other creatures with counters on them besides Falco Spara, it will highlight the top card of my library as if it is castable, but when I try to actually cast it, it leaves it on the stack with the only available option to cancel casting the card.