Retreat to Tree Palace

Whenever a green creature enters the battlefield
under an opponent's control, untap target
creature you control. Prevent all combat damage
that would be dealt to that creature this turn.
{3}{g}{g}: Create a 0/5 Legendary green Plant Wall creature token with defender named Tree Palace.
It has "{t}: Add {g}."
"It towers high above the untamed canopy. Pray they
don't learn to climb."