What term is used for cards that can change their characteristics under specific conditions?

The term used for cards that can change their characteristics under specific conditions is "double-faced cards." These cards have two distinct sides, each with its own set of characteristics, abilities, and sometimes even card types. A player may choose to play one side or the other, typically by following specific conditions indicated on the card or in the rules governing its use.

Double-faced cards add strategic depth to gameplay, as players must consider not only the side that is currently in play but also when or if to transform it to the other side, depending on the game's situation or state. It's important to note that while transformable cards is a common way to refer to these cards, the official terminology recognized in the rules is "double-faced cards."

Enchantments are a permanent type of card but do not inherently change their characteristics based on conditions. Interactive cards typically refer to cards that engage with other cards through effects but do not necessarily imply a change in characteristics.