Calamity, Galloping Inferno

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

If the copied creature is a token, the token that's created copies the original characteristics of that token as stated by the effect that created that token.

Although the tokens enter the battlefield attacking, they were never declared as attackers. Abilities that trigger whenever a creature attacks won't trigger. If there are any costs to have a creature attack, those costs won't apply to the tokens.

You may activate a permanent's saddle ability even if that permanent is already saddled.

An ability that triggers when a creature "attacks while saddled" will trigger only if that creature was saddled when it was declared as an attacker.

Each of the tokens copies exactly what was printed on the original creature and nothing else (unless that creature 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.