Brobdingnagian Obryk

Swarm — Brobdingnagian Obryk has trample
and reach if you control 5 or more creatures.
If Brobdingnagian Obryk is the target of a spell
an opponent casts, you may counter that spell.
If you do, sacrifice Brobdingnagian Obryk at
the start of your next turn.
Obryk was the runt of the hatchlings and scared of the
bigger beasts. He wished to grow. And now, towering
over the trees, he's never been more afraid.