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Say Silverbolt attacks and his alt-mode ability triggers, allowing him to flip to bot mode thus making his base attack 3. If that is the case, then why would Optimus Prime - Battlefield Legend not get +5 attack if he attacks, uses his bot-mode ability and flips Rapid Conversion which in turn flips a tapped Thrust to bot-mode? Both Silverbolt and Thrust have triggered abilities but only Silverbolt benefits from the higher attack value. Why? Thrusts alt-mode effect mentions this character NOT this mode or alt mode?

Thrusts ability only triggers at the time of attack and does not check again. Silverbolt is not adding his attack, he is using his attack to determine the damage at the last point after hes flipped and just before damage is dealt.
Source: Wizards of the Coast (2019-03-08)    【Link to Ruling】
Tags: Attacking