Fire Lord Zuko explicitly says: When a permanent enters from exile, youll put a +1/+1 counter on each creature you control
[3] (Quick Effect): You can send 1 face-up "Umi" you control to the GY
Bring your story to life in the Wilds of Eldraine, and fight for your fairy tale ending
Anyhow, if you dont want to use By Force or Vandalblast, theres cool alternatives with: Fury Charm also lets you pump your creature, Molten Frame lets you draw a card instead and Gleeful Demolition is really cool for Goblin decks
(6/16/2023) Some cards refer to the "amassed Army." That means the Army creature you chose to receive counters, even if no counters were placed on it for some reason.
To be precise, PSAGraded ended the search with a tweet revealing that this totally unique card had been found, authenticated, and graded at mint condition