Take One For The Team

Sacrifice target creature. All your creatures get
+X/+X until end of turn, where X is that card's converted mana cost.
"He rushed into the soldiers at full speed. They sliced
him multiple times with their axes and swords, but
what the soldiers didn't know is that the rest of the
Boros were approaching from behind. It was that
dwarf's brave sacrifice that led to the Boros's victory.
He lies here in peace."
-Inscription on a tomb in Ravnica