Safari zone

At the beginning of each prayers upkeep, that
player may exile up to five cards from the top of
their Library. Put a Safari Zone counter on All Creatures exiled this way.
{2}: Create a Pokeball artifact. Any player may activate this ability.(pokeballs have "sacrifice this artifact: Roll a D6. If you roll 4 or higher, return
a Creature from exile with a Safari Zone counter
on it to the battlefield under your control.
Activate this ability only on your turn.")