Tracer, Time Skirmisher

Haste, First Strike, Vigilance
If Tracer were to die, you may pay X instead,
where X is the number of times this cost has
been paid. Tracer gains double strike until the
end of your next turn
{2}{w}{r}: Put a pulse bomb counter on the target creature.
At the beginning of your upkeep, Tracer deals
damage equal to their power to each creature
with a pulse bomb counter on them