Nature's Rhythm froze my competitive game and my turn was skipped after the spell fizzled. I was going to win the game and lost due to this so unfun!!

I went to cast Nature's Rhythm and tried tapping multiple of my scute swarms to pay for a portion of its cost while having 6 floating green mana as well as 3 untapped lands. I tap my scutes and the submit button grays out once I go past more than 1 scute. I try to cancel the cast and try again but I am forced to watch my turn timer deplete and my spell fizzles.

The expected results were to cast my spell using tapped creatures

My workaround is playing paper magic instead or Hearthstone