Ignition Effect

Source: Yugioh Wikia

Ignition Monster Effects require a manual activation by the card's controller during their Main Phase 1 or 2 (unless stated otherwise on the card). They are available to use as soon as the card hits the field.

This type of effect used to be called a "Cost Effect" in the early days of Yu-Gi-Oh!, which was slightly confusing because not all of those monsters had a cost.

Examples of Monster Ignition Effects: "| XYZ-Dragon Cannon", "| Bazoo the Soul-Eater", "| Blackwing - Gale the Whirlwind", "| Card Trooper" and "| XX-Saber Faultroll".