Have a Question For Elves

[Nanocarter23]

So if I have the card {intruder alarm} on the battlefield can i get infinite 1/1s with the card {presence of gond}?   And also does {presence of gond} combo with {nettle sentinal}?  Why or why not?  Both cards mention the term comes into play....

[particle]

so {intruder alarm} does combo with {presence of gond} to make infinite 1/1's by tapping and untapping repeatedly. The problem with {nettle sentinel} however is that is says "when you cast a green spell" which you are not doing. you are instead, activitating an ability.