Darkroot Sorcerer

Flash
When Darkroot Sorcerer enters the battlefield,
counter target spell, activated or triggered ability.
Hallow {3}{u}{u} (Discard a card and pay this card's
Hallow cost and Exile this creature from your
graveyard: Create a tapped Hallow creature token
that's a copy of this card. You may Hallow at Instant
Speed.)