Ignition Effect
Ignition Monster Effects are Spell Speed 1 effects that require a manual activation by the card's controller during their own Main Phase 1 or 2 (except "Red-Eyes Wyvern", "Daigusto Eguls", "Alchemic Magician", "Speed Warrior", "Splendid Rose" and "General Gantala of the Ice Barrier"). 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.
As of March 19th 2011, for the OCG only, these effects can no longer be activated in response to a monster's Summon; e.g. In the OCG, you cannot activate the effect of "Lonefire Blossom" while you retain Priority when you Summon it.
As of April 25th, 2012, Ignition Priority has been removed from the TCG.
Examples of Monster Ignition Effects: "Cyber Gymnast", "XYZ-Dragon Cannon", "Bazoo the Soul-Eater", "Blackwing - Gale the Whirlwind", "3-Hump Lacooda", "Card Trooper", "Dark Simorgh", "Lonefire Blossom", "XX-Saber Faultroll" and almost all Xyz monsters.
Example
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