Katarina, The Sinister Blade

When Katarina, the Flameblade enters the battlefield, she deals 2 damage to any target.
At the beginning of your upkeep, you may pay R.
If you do, Katarina deals 1 damage to the target
creature or player.
Whenever a creature dealt damage by Katarina
this turn dies, put a +1/+1 counter on Katarina.
If you do, you may choose if Katarina fights
another target creature.