Mirror Match

If the copied creature is copying something else, then the token enters the battlefield as whatever that creature copied.

Each token copies exactly what was printed on the original creature and nothing else (unless that permanent is copying something else or is a token; 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.

If the tokens aren’t creatures (perhaps because the attacking creature was an animated land), they’ll enter the battlefield but they won’t be blocking. Attacking creatures that weren’t otherwise blocked will remain unblocked.

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.

The delayed triggered ability that exiles the tokens will trigger at end of combat no matter what happens to the original creature.

If Mirror Match creates more than one token for any given attacking creature (due to an effect such as the one Doubling Season creates), each of those tokens will enter the battlefield blocking the creature it’s a copy of. All of those tokens will be exiled by the delayed triggered ability.