Griffin Guide

Enchant creature
Enchanted creature gets +2/+2 and has flying.
When enchanted creature dies, create a 2/2 white Griffin creature token with flying.

Tethered Griffin

Flying
When you control no enchantments, sacrifice Tethered Griffin.

At the beginning of your end step, if you gained 3 or more life this turn, create a 2/2 white Griffin creature token with flying.

{T}: Add {C}.
{T}: Untap target Griffin. If it's a creature, it gets +1/+1 until end of turn.

As long as you control a Griffin creature, Griffin Rider gets +3/+3 and has flying.