Sure, Pursuit of Knowledge is on the battlefield when Kaleidostone's ETB triggered ability resolves and would make you draw a card. Like all ETB triggered abilities, it uses the stack, and it doesn't even go on the stack, let alone resolve, until Kaleidostone is firmly on the battlefield, along with anything returned by Open the Vaults at the same time.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
Can I somehow use his 2nd ability, sacrifice him, and exile him with the ability? I don't see why not, but I'm not sure when you choose which cards. Gut feeling says yes.
Can I somehow use his 2nd ability, sacrifice him, and exile him with the ability? I don't see why not, but I'm not sure when you choose which cards. Gut feeling says yes.
It would take something like Suppression Field along with a mana ability that you can sacrifice Psychatog to. Otherwise, you do not get the opportunity to sacrifice anything between announcing that ability and paying its cost.
602.2a The player announces that he or she is activating the ability. If an activated ability is being activated from a hidden zone, the card that has that ability is revealed. That ability is created on the stack as an object that's not a card. It becomes the topmost object on the stack. It has the text of the ability that created it, and no other characteristics. Its controller is the player who activated the ability. The ability remains on the stack until it's countered, it resolves, or an effect moves it elsewhere.
602.2b The remainder of the process for activating an ability is identical to the process for casting a spell listed in rules 601.2b-h. Those rules apply to activating an ability just as they apply to casting a spell. An activated ability's analog to a spell's mana cost (as referenced in rule 601.2e) is its activation cost.
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Why bother with mere rulings when so many answers can be found in the Rules?
Can I somehow use his 2nd ability, sacrifice him, and exile him with the ability? I don't see why not, but I'm not sure when you choose which cards. Gut feeling says yes.
Since this is entirely unrelated to the original post, this should have been a new thread.
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Level 2 Magic Judge
Please use card tags when you're asking a question about specific cards: [c]Serra Angel[/c] -> Serra Angel.
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Lets say I've got a card that makes me draw on etb, like Kaleidostone and Pursuit of Knowledge in my graveyard before casting Open the Vaults, can I choose to forgo the draw to put the study counter on Pursuit of Knowledge?
Another quickie:
Psychatog
Can I somehow use his 2nd ability, sacrifice him, and exile him with the ability? I don't see why not, but I'm not sure when you choose which cards. Gut feeling says yes.
It would take something like Suppression Field along with a mana ability that you can sacrifice Psychatog to. Otherwise, you do not get the opportunity to sacrifice anything between announcing that ability and paying its cost.
Thank you.
Since this is entirely unrelated to the original post, this should have been a new thread.
Please use card tags when you're asking a question about specific cards: [c]Serra Angel[/c] -> Serra Angel.