Once any abiity in MTG has been activated or thas triggered it is completely independant of its source. If you want to stop the ability from happening you need to deal with it directly with something like stifle.
In your examples Griselbrand will still draw the player 7 cards and the game will remember how many counters Aether vial had on it and allow the player to put a creature with a CMC equal to the charge counters that were on the vial.
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All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
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Once an abilities costs have been paid and it's on the stack, removing the source of the ability doesn't change that.
112.7a Once activated or triggered, an ability exists on the stack independently of its source. Destruction or removal of the source after that time won’t affect the ability. Note that some abilities cause a source to do something (for example, “Prodigal Pyromancer deals 1 damage to target creature or player”) rather than the ability doing anything directly. In these cases, any activated or triggered ability that references information about the source because the effect needs to be divided checks that information when the ability is put onto the stack. Otherwise, it will check that information when it resolves. In both instances, if the source is no longer in the zone it’s expected to be in at that time, its last known information is used. The source can still perform the action even though it no longer exists.
If I throw a hand grenade at you, and you shoot me with a gun while the grenade is in the air, does the grenade still land at your feet and explode?
For Aether Vial, it will use Last Known Information to determine what creature you can put into play.
608.2g If an effect requires information from the game (such as the number of creatures on the battlefield), the answer is determined only once, when the effect is applied. If the effect requires information from a specific object, including the source of the ability itself, the effect uses the current information of that object if it’s in the public zone it was expected to be in; if it’s no longer in that zone, or if the effect has moved it from a public zone to a hidden zone, the effect uses the object’s last known information. See rule 112.7a. If an ability states that an object does something, it’s the object as it exists—or as it most recently existed—that does it, not the ability.
Note that this is different if you simply remove all the counters from the Vial (via Vampire Hexmage for example).
In that case when the ability resolves you could only put a 0CMC creature on the field.
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Do they still draw the cards if it's not in play?
And a similar situation...
A person taps an Aether Vial and response I Echoing Truth it back to their hand.
Does the creature still come into play even though Aether Vial is not in play?
.
I'm not sure how that plays out if the ability is (or doesn't stay) on the stack / the card not being in play.
In your examples Griselbrand will still draw the player 7 cards and the game will remember how many counters Aether vial had on it and allow the player to put a creature with a CMC equal to the charge counters that were on the vial.
- H.L Mencken
I Became insane with long Intervals of horrible Sanity
All Religion, my friend is simply evolved out of fraud, fear, greed, imagination and poetry.
- Edgar Allan Poe
The Crafters' Rules Guru
If I throw a hand grenade at you, and you shoot me with a gun while the grenade is in the air, does the grenade still land at your feet and explode?
For Aether Vial, it will use Last Known Information to determine what creature you can put into play.
Note that this is different if you simply remove all the counters from the Vial (via Vampire Hexmage for example).
In that case when the ability resolves you could only put a 0CMC creature on the field.