Mount

Came up with an idea for mounts in magic. Ride [cost] means "[Cost]: Unattach all creatures from ~this~ attach target non-mount creature you contorl to ~this~. Play this ability only when you could play a sorcery." and "~this~ gets +X/+Y where X is the power and Y is the thoughness of creatures attached to ~this~" Additionally, you hafta change the rules so that creatures attached to permenants don't unnatach, but instead creatures attached to things can't attack or block.

Riding Bear 1G
Creature - Bear Mount
Ride 1G
2/2