Excalibur-the most annoying

Flash, First strike
Excalibur-the most annoying enters the
battlefield with X +1/+1 counters on it.
{t}: Excalibur-the most annoying deals damage
to target attacking or blocking creature equal
to its power. Put a soul counter on Excalibur-the
most annoying.
When Excalibur-the most annoying has three or
more soul counters exile Excalibur-the most
annoying, then return it to the battlefield
transformed under your control.