"May" abilities

[prayos]

Are these decided when the ability goes on the stack, or on resolution of the ability?  Thanks!

[tsul25]

I'd assume before going on the stack. "May" means you can do something, but you don't have to do it. If you don't do it, there won't be anything to go on the stack. If you do choose to do something, your opponent will need to know what they are responding to, therefore you must have already made your decision.

[Maximo]

May abilities are triggered by you. If you forget about the ability you can't go back and redo it or something, you missed it. So, you put them on the stack yourself.

[BlackJester]

The abilities will trigger and be put on the stack. When they resolve, you decided whether or not to apply it.

Confirmed. 🔨

[prayos]

The abilities will trigger and be put on the stack. When they resolve, you decided whether or not to apply it.

Confirmed. 🔨

So, in the instance of say {Fiend Hunter}, I have no chance to bounce the Hunter and permanently exile their targeted creature?

[tsul25]

The abilities will trigger and be put on the stack. When they resolve, you decided whether or not to apply it.

Confirmed. 🔨

Wait, so say he has a creature with something like "at the beginning of your upkeep you may choose to tap target creature." You're saying that that ability goes on the stack and he doesn't have to choose which creature to tap until it resolves? Does that mean if he taps a creature of mine that has a tap ability that I will be unable to respond by tapping that creature because his ability already resolved even though I didn't know the target of it?

[tsul25]

Okay wait. I thought about it for a second. So does the may ability go on the stack and resolve, and upon resolution put the tap target creature on the stack?

[BlackJester]

No, you have to choose targets when it goes on the stack. But as it resolves, you can decide then whether or not to actually do it.

Say you cast {Slayer of the Wicked}, you'd target a creature if you can. Then, your opponent casts {Undying Evil} on their guy. When your ability resolves, you can say "no thanks" and not destroy it.

[prayos]

No, you have to choose targets when it goes on the stack. But as it resolves, you can decide then whether or not to actually do it.

Say you cast {Slayer of the Wicked}, you'd target a creature if you can. Then, your opponent casts {Undying Evil} on their guy. When your ability resolves, you can say "no thanks" and not destroy it.

Seems like poo that I can't properly respond to them choosing to use the ability.  But eh.