Depending on what other cards use this mechanic of spending dissipate tokens to power an ability, these quick cast force creatures might be the necesary coin to power said abilities. I quite like the idea of casting your coin on the board, knowing it will disappear, but untill it does, your coin can hit or guard. If you want to use your special powers, you 'burn' your creatures to power them.
We'll see what else is consuming dissipate tokens.
Both the upkeep-cards and the dissipate-cards are well in theme for the forcemaster.
She was the mage of powerfull abilities with an ongoing cost, these upkeep-cards are her post-paid abilities. Now she changed her payment plan to a pre-paid system with the dissipate-cards.