Marissa, the Mythoblade

Flash, haste, double-strike
This spell may not be countered.
Marissa has hexproof during combat steps.
Whenever an opponent deals damage to you,
Marissa gets an enrage counter. As long as Marissa
has an enrage counter, she has base power and
toughness 9/3. At the beginning of your end-step,
remove all enrage counters from Marissa.