Obviously Goblin Guide is a solid aggressive 1-drop...

The real reason I wanted to start a thread about this guy is because I think the vast majority of people play him incorrectly in tournaments. So I pose the questions...

When do you play him on turn 1?
When do you NOT play him on turn 1?

If you have a Kird Ape and Goblin Guide in hand on turn 1 (in a RG deck), which do you play first and why? What factors change this decision?

If you have a Wild Nacatl and Goblin Guide in hand on turn 1 (in a Naya deck), which do you play first and why? What factors change this decision?

In your Burn deck, do you kill the Deathrite on turn 1 or play the Guide?
In your Zoo deck, do you kill the Deathrite on turn 1 or play the Guide?