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Notorious TeamTron member, Henrik Has-Never-Been-Defeated-In-Old-School-Magic-In-Denmark Storm and I, tried to boil down a definition, but the closest we ever got was something along the lines of: A synergy between two or more cards, that is easily disruptable . I dont think that is very precise nor a very useful definition, because by this definition you will open a way too broad aspect of the game to being combo

You had my curiosity, but now you have my attention

Here we will explore the different types of standard card sizes, as well as the variations in their usage in various games and regions

That last part is important