The Mercenary, Hired Blade

Survivor
Whenever this creature attacks, put an expose counter on target opponent creature.
Whenever a creature with an expose counter is put in the graveyard, put a +1/+1 counter on this card.

“ The Mercenary sheathed his blade. His footsteps were unheard as he left the palace– masked by the rhythmic ticking of the clock. Tick, tock. Tick, tock.”