Disowned Ancestor
Creature — Spirit Warrior
Outlast 
(, 
: Put a +1/+1 counter on this creature. Outlast only as a sorcery.)
Long after death, the spirits of the Disowned continue to seek redemption among their Abzan kin.
Zack Stella
The List (PLST)
• #KTK-70Rulings
Several creatures with outlast also grant an ability to creatures you control with +1/+1 counters on them, including themselves. These counters could come from an outlast ability, but any +1/+1 counter on the creature will count.
(wotc • 2014-09-20)
The cost to activate a creature’s outlast ability includes the tap symbol ({T}). A creature’s outlast ability can’t be activated unless that creature has been under your control continuously since the beginning of your turn.
(wotc • 2014-09-20)
Rulings
Several creatures with outlast also grant an ability to creatures you control with +1/+1 counters on them, including themselves. These counters could come from an outlast ability, but any +1/+1 counter on the creature will count.
(wotc • 2014-09-20)
The cost to activate a creature’s outlast ability includes the tap symbol ({T}). A creature’s outlast ability can’t be activated unless that creature has been under your control continuously since the beginning of your turn.
(wotc • 2014-09-20)