Block of Magic

Counter target spell. If its controler had a red,
green, or white permanent in play when the spell
was countered, Block of Magic deals 5 damage to
any target and target player mills the top 5 cards
of their library.
Flashback, {3}{u/b}{u/b} (You may cast this card from
your graveyard for its flashback cost.)
"Attacking an opponent will lead to dangerous things
if they know the deflection and repetition. As well as
the attack after block."—Corrall, Night Justice