Guul Heart, The Strong

Double Strike, Vigilance. This card cannot be
tapped by any means.
If Guul Heart, The Strong is blocked or becomes blocked. Tap the creature if it is not destroyed.
It does not untap during there nest untap step.
When Guul Heart, The Strong deal damage to a
player or plainswalker, put a +1/+1 counter on
this card for every time this card has dealt
damage to a player or planeswalker