Rulings

• If the copied creature is itself a token, the tokens created by Rionya copy the original characteristics of that token as stated by the effect that created it.2021-04-16
• If the copied creature has {X} in its mana cost, X is 0.2021-04-16
• Any enters-the-battlefield abilities of the copied creature will trigger when the tokens enter the battlefield. Any "As [this creature] enters the battlefield" or "[This creature] enters the battlefield with" abilities of the copied creature will also work.2021-04-16
• The tokens copy exactly what is printed on the creature and nothing else (unless that creature is a token or is copying something else; see below). They don't copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and/or Equipment attached to it, or any non-copy effects that changed its power, toughness, types, color, and so on.2021-04-16
• The triggered ability counts all instants and sorceries that were cast before it resolves. If you cast instant spells in response to the ability, those spells will count.2021-04-16
• If the copied creature is copying something else, the tokens enter the battlefield as whatever that creature is copying.2021-04-16