For the ability to trigger, Spireside Infiltrator has to actually change from untapped to tapped. If an effect attempts to tap it, but it was already tapped at the time, this ability won't trigger.
20-09-2016
wotc
This is a triggered ability, not an activated ability. It doesn't allow you to tap Spireside Infiltrator whenever you want; rather, you need some other way of tapping it, such as by attacking.
Random a card of Magic: The Gathering (MTG), but you can also roll the D20 dice, random a Planeswalker, have fun with the random rules and more.
Deruchenko Alexander2016-09-30
