Infectious Bloodlust — ruling 1

If, during its controller’s declare attackers step, the enchanted creature is tapped or is affected by a spell or ability that says it can’t attack, then that creature doesn’t attack. If there’s a cost associated with having that creature attack, its controller isn’t forced to pay that cost. If they don’t, the creature doesn’t have to attack.

Infectious Bloodlust : règles, fonctionnement et interactions (MTG)

Infectious Bloodlust 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

Enchant creature Enchanted creature gets +2/+1, has haste, and attacks each combat if able. When enchanted creature dies, you may search your library for a card named Infectious Bloodlust, reveal it, put it into your hand, then shuffle.

How it works : Infectious Bloodlust

Original English text — Wizards of the Coast / Scryfall

#1June 22, 2015· Wizards of the Coast
If, during its controller’s declare attackers step, the enchanted creature is tapped or is affected by a spell or ability that says it can’t attack, then that creature doesn’t attack. If there’s a cost associated with having that creature attack, its controller isn’t forced to pay that cost. If they don’t, the creature doesn’t have to attack.
No other card is named in this ruling.