Bloodspore Thrinax

Devour 1 (As this creature enters, you may sacrifice any number of creatures. It enters with that many +1/+1 counters on it.)
Each other creature you control enters with an additional X +1/+1 counters on it, where X is the number of +1/+1 counters on this creature.

Commander Masters

Devour 1 (As this enters the battlefield, you may sacrifice any number of creatures. This creature enters the battlefield with that many +1/+1 counters on it.)
Each other creature you control enters the battlefield with an additional X +1/+1 counters on it, where X is the number of +1/+1 counters on Bloodspore Thrinax.

Double Masters

Commander Anthology

Legendary Cube Prize Pack

If Bloodspore Thrinax enters the battlefield at the same time as other creatures you control, those creatures won't get additional +1/+1 counters from Bloodspore Thrinax's last ability. Those creatures also can't be devoured by Bloodspore Thrinax.