Mirrorpool

If the copied spell is modal (that is, it says “Choose one —” or the like), the copy will have the same modes. You can’t choose different ones.

If the copied creature is copying something else when the ability resolves, then the token enters the battlefield as a copy of whatever that creature is copying.

Any enters-the-battlefield abilities of the copied creature will trigger when the token enters the battlefield. Any “as [this permanent] enters the battlefield” or “[this permanent] enters the battlefield with” abilities of the copied creature will also work.

For example, if a token copies a Plains that’s been affected by a spell with awaken, the token will be just a land, even though the object being copied is currently a land creature. The same is true if the land has an ability that animates it.

For Mirrorpool’s last ability, the token copies exactly what’s printed on the original creature and nothing else (unless that creature is copying something else; see below). It doesn’t copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its power, toughness, types, color, and so on.

Mirrorpool’s third ability can target (and copy) any instant or sorcery spell, not just one with targets.