A single animation with more work to come

The single animation is a 3D creature with 4 legs, multiple tails and mandibles on it's face. (see the attached picture for a reference) For the full game I'm going to need some riggers and animators for 5+ creatures that have between 2 and 6 legs and have tails on top of that. I would love to come to an agreement on the lines of if you 'donate' an 'idle' animation for my most complex creature then I would be happy to pay you for all the other animations? each creature would need: 4-5 attacks surface transitions (floor to walls to ceilings) idle animations (loop-able) walking animations running animations 'roar' animations and more! If you are interested when the demo game is complete (this weekend) I will give you a game key as a thank you as well as further work.