Acute Mark

As an additional cost to cast this spell, you
may choose a creature you control with first
strike. If you do, target creature an opponent
controls blocks that creature this turn if able.
Otherwise, target creature an opponent
controls must block this turn if able.
———{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}{line}
While the battlefield is known for its emphasis
on tact and skill, often it boils down to speed.