Arc Warlock

Paracausal, Arc, Reach
{t} Regenerate target Guardian. If there is a
Ghost on the field you may return target
Guardian from the graveyard to the field.
{t} As an additional cost sacrifice an Arc token.
Deal 3 damage to up to 3 target creatures.
{t} As an additional cost sacrifice 3 Arc tokens.
Ark Warlock deals x damage to up to 4 target
creatures, planeswalkers or players where x is
Ark Warlock's power * 2