I used this card's [On Deletion] effect to place a [EX3-069 Trial of the Four Great Dragons] from my hand in the battle area. Does [EX3-069 Trial of the Four Great Dragons]'s "[Main] <Draw 1>. Then, place this card in your battle area." effect activate?
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Official Ruling
No, it doesn’t activate. This card's [On Deletion] effect only places a [Trial of the Four Great Dragons] from your hand in the battle area when you don't already have a [Trial of the Four Great Dragons] placed.
Source: EX3-025 Azulongmon