Tetzimoc, Primal Death

Deathtouch
{B}, Reveal this card from your hand: Put a prey counter on target creature. Activate only during your turn.
When Tetzimoc enters, destroy each creature your opponents control with a prey counter on it.

Rivals of Ixalan

Deathtouch
{B}, Reveal Tetzimoc, Primal Death from your hand: Put a prey counter on target creature. Activate this ability only during your turn.
When Tetzimoc enters the battlefield, destroy each creature your opponents control with a prey counter on it.

Rivals of Ixalan Promos

Tetzimoc's triggered ability doesn't care how a prey counter got onto a creature an opponent controls or whose Tetzimoc put that counter on the creature. Tetzimoc is happy to eat all the opponent's prey it can see.

You can activate Tetzimoc's activated ability more than once during your turn.