Avae, Who Blesses All

Blessing (Whenever a creature you control attacks or blocks, that creature gains either +1/+0 or +0/+1 for
each non attacking or non blocking creature with
blessing)
{3}{g}{w}{u}: Untap all creatures you control. After
this main phase, there is an additional combat
phase followed by an additional main phase.
Activate this ability only any time you could cast
a sorcery.