An opponent's Digimon is targeted by this card's [On Play] effect. If it later becomes level 6 or above, does it lose the <Security Attack -1> gained from this effect?
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No. As long as it was level 5 or lower when this effect was activated, the effect remains and it still has <Security Attack -1>?even if it later becomes level 6 or higher.
Source: BT10-030 Tinkermon