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When two Optional Trigger Effects try to activate at the same time such as two copies of "Mystic Tomato" destroy each other in battle, neither will miss the timing, as the last thing to happen was both being sent to the Graveyard. Both of the effects trigger at the same time, and form a [[Chain]]. The Turn Player's effect becomes Chain Link 1, and the opponent's effect becomes Chain Link 2.
Only the activation of an Optional Trigger Effect can [[miss the timing]]. In other words, as long as the effect is activated, the resolution will never miss the timing. So two monsters will be summoned in the above example.
'''Compulsory Trigger Effects''' are effects that must [[resolve]], and are not Optional. If such effect would miss the timingconditions for their activations are met during a Chain that is currently resolving, start a new they can only be activated after the current Chainis completely resolved.
'''Identifying Trigger Effects''' can be done, for cards made after [[Problem-Solving Card Text|PSCT]] change, by looking for a timing related condition, followed by a colon " ''':''' ". Some of these cards are not necessarily Trigger Effects, such as Ignition effects that are usually in the form "''Once per turn: You can...''" or "''During your Main Phase: You can...''" If you are not sure what type of effect(s) a card has, the information can be looked up. Note that cards like [[Obelisk the Tormentor]] with PSCT have the word "''When''" but don't have a colon. Instead, these usually denote [[Condition Effect|conditions]].
