Tula, Honorbound Seraph

Flying, Double Strike, Indestructible
If Tula blocks or is blocked by one or more creatures with toughness 12 or less, destroy those creatures.
Dutybound- You may pay {w}{w}{b}{b}{r}{r}. If you do, destroy all creatures that were dealt damage this turn. Exile Tula. (Dutybound triggers whenever a creature you control deals combat damage and this creature is in the graveyard)