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Flying
Whenever Immersturm Predator becomes tapped, exile up to one target card from a graveyard and put a +1/+1 counter on Immersturm Predator.
Sacrifice another creature: Immersturm Predator gains indestructible until end of turn. Tap it.
For the triggered ability to trigger, Immersturm Predator has to actually change from untapped to tapped. If an effect attempts to tap it while it is already tapped, the ability won’t trigger.
Immersturm Predator’s triggered ability doesn’t allow you to tap Immersturm Predator. You have to find some other way to tap it. Let us suggest attacking.
You can activate Immersturm Predator’s last ability even if it’s already tapped.
You can put the triggered ability on the stack without a target. As it resolves, you’ll just put a +1/+1 counter on Immersturm Predator. However, if you do choose a target, and that card is an illegal target as the ability tries to resolve, the ability won’t resolve and none of its effects will happen. In that case, you won’t put a +1/+1 counter on Immersturm Predator.
