1. Yes. When the Groundbreaker enters the battlefield, Primal Forcemage is also on the battlefield, so its triggered ability is 'online' and ready to see that event.
2. Yes. Though the triggered ability triggers while Collected Company is still on the Stack (not yet in the graveyard), the ability is put on the Stack after the spell finishes resolving, and you choose targets at that time.
addendum: Triggered abilities wait to be put on the Stack until the next time a player would receive priority, after exhausting applicable State-Based Actions. In this case, that's after a spell resolves.
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1. I cast Collected Company and with it I get Groundbreaker and Primal Forcemage. Does Primal Forcemage trigger and give the Groundbreaker the +3/+3?
2. I cast Collected Company and with it I get an Eternal Witness. Can the Eternal Witness get back the Collected Company that put it into play?
2. Yes. Though the triggered ability triggers while Collected Company is still on the Stack (not yet in the graveyard), the ability is put on the Stack after the spell finishes resolving, and you choose targets at that time.
addendum: Triggered abilities wait to be put on the Stack until the next time a player would receive priority, after exhausting applicable State-Based Actions. In this case, that's after a spell resolves.
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