Apparently Obvious

Split Second (As long as this spell is on the stack,
players can't cast other spells or activate abilities
that aren't mana abilities.)
Delayed (You must pay the mana cost of this spell.
Then exile it face-up. You may cast this card without
paying its mana cost on a turn after this one at any
time you could cast an instant.)
Counter target spell.
You saw it! And yet you still fell for it!