Duskwood Goliath

Reach, trample (This creature can block creatures
with flying and if this creature would assign enough
damage to its blockers to destroy them, you may have
it assign the rest of its damage to defending player or
planeswalker.)
When Duskwood Goliath blocks or becomes
blocked by a creature with flying, it gets
double strike until end of turn. (This creature
deals both first-strike and regular combat damage.)