Assault Formation (DTK 173)

Enchantment • Mana cost: {1}{G} • Dragons of Tarkir • Rare

Each creature you control assigns combat damage equal to its toughness rather than its power.
{G}: Target creature with defender can attack this turn as though it didn't have defender.
{2}{G}: Creatures you control get +0/+1 until end of turn.

Illustrated by Kieran Yanner.