Aspen, the Wonder-All

Polysoulbond (this creature can soulbond with any
number of creatures, one bond per turn)
As long as this creature is bonded, this creature
has regenerate.
As long as this creature is bonded with four or
more creatures, this creature has "{3}{g}{ut}:
until end of turn, target creature has an
aura which says "this creature can only block
targets with higher power than it."