Arni Brokenbrow | Legendary Creature | Human Berserker | Haste
Boast — {1}: You may change Arni Brokenbrow's base power to 1 plus the greatest power among other creatures you control until end of turn. (Activate only if this creature attacked this turn and only once each turn.) | Dmitry Burmak
Birgi, God of Storytelling | Legendary Creature | God | Whenever you cast a spell, add {R}. Until end of turn, you don't lose this mana as steps and phases end.
Creatures you control can boast twice during each of your turns rather than once. | Eric Deschamps
4.0 LSV