It's no coincidence that the oldest trolls are also the angriest.

Troll Ascetic

Hexproof (This creature can't be the target of spells or abilities your opponents control.){1}{G}: Regenerate Troll Ascetic.

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
{1}{G}: Regenerate this creature.

Troll Ascetic can't be the target of spells or abilities your opponents control.
{1G}: Regenerate Troll Ascetic.

Commander Anthology Volume II

Hexproof (This creature can't be the target of spells or abilities your opponents control.)
{1}{G}: Regenerate Troll Ascetic.

Duel Decks: Heroes vs. Monsters

Commander 2011

Salvat 2011

Duels of the Planeswalkers

Tenth Edition

Troll Ascetic can't be the target of spells or abilities your opponents control.
{1G}: Regenerate Troll Ascetic. (The next time this creature would be destroyed this turn, it isn't. Instead tap it, remove all damage from it, and remove it from combat.)