Yorvo, Lord of Garenbrig

Yorvo, Lord of Garenbrig enters with four +1/+1 counters on it.
Whenever another green creature you control enters, put a +1/+1 counter on Yorvo. Then if that creature's power is greater than Yorvo's power, put another +1/+1 counter on Yorvo.

Throne of Eldraine Promos

Throne of Eldraine

If the entering green creature dies before Yorvo's triggered ability resolves, use its power as it last existed on the battlefield to determine whether Yorvo gets a second +1/+1 counter.

Yorvo's triggered ability compares the power of the entering green creature only after putting a +1/+1 counter on Yorvo. If that counter causes Yorvo's power to be greater than or equal to the entering creature's power, it won't get a second +1/+1 counter.