Ib Halfheart, Goblin Tactician — ruling 1

If you don’t actually sacrifice the Goblin (because it was removed from the battlefield before the ability resolved, for example), no damage is dealt.

Ib Halfheart, Goblin Tactician : règles, fonctionnement et interactions (MTG)

Ib Halfheart, Goblin Tactician 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

Whenever another Goblin you control becomes blocked, sacrifice it. If you do, it deals 4 damage to each creature blocking it. Sacrifice two Mountains: Create two 1/1 red Goblin creature tokens.

How it works : Ib Halfheart, Goblin Tactician

Original English text — Wizards of the Coast / Scryfall

#1September 25, 2006· Wizards of the Coast
If you don’t actually sacrifice the Goblin (because it was removed from the battlefield before the ability resolved, for example), no damage is dealt.
Card named in this ruling
Goblin