Evelynn, Agony's Embrace

As long as you've cast an instant this turn,
Evelynn, Agony's Embrace is unblockable.
Whenever Evelynn, Agony's Embrace deals
combat damage to a player, that player puts the
top X cards of their library into their graveyard,
where X is the damage dealt.
"It's better in the dark..."
— Evelynn, Agony's Embrace