Ajani's Voyage

Creatures you control get +0/+1 equal to the number of time counters on Ajani's Voyage.
At the beginning of your upkeep, put a time counter on Ajaini's Voyage.
Sacrifice Ajani's Voyage: Return target creature from your graveyard to the battlefield under your control with converted mana cost equal to the number of time counters on Ajani's Voyage.