Garbage Fire — ruling 1

For example, if you draft Garbage Fire as the third card in a draft round and then another one as the twelfth card in a draft round, each Garbage Fire will deal 12 damage. Yikes.

Garbage Fire — ruling 2

If you somehow cast, copy, or gain control of Garbage Fire but you didn't draft one, the highest noted number is considered to be 0, so Garbage Fire won't deal any damage.

Garbage Fire : règles, fonctionnement et interactions (MTG)

Garbage Fire is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.

Official card text

Reveal this card as you draft it and note how many cards you've drafted this draft round, including this card. Garbage Fire deals damage to target creature equal to the highest number you noted for cards named Garbage Fire.

How it works : Garbage Fire

Original English text — Wizards of the Coast / Scryfall

#1August 23, 2016· Wizards of the Coast
For example, if you draft Garbage Fire as the third card in a draft round and then another one as the twelfth card in a draft round, each Garbage Fire will deal 12 damage. Yikes.
No other card is named in this ruling.
#2August 23, 2016· Wizards of the Coast
If you somehow cast, copy, or gain control of Garbage Fire but you didn't draft one, the highest noted number is considered to be 0, so Garbage Fire won't deal any damage.
No other card is named in this ruling.