Introduction to Prophecy Combo decks that use learn cards usually benefit from running Introduction to Prophecy in their sideboard because they can use it as an extra card draw effect while assembling their combo
That's the back of the cards
Pokemon TCG Pocket makes use of troublesome Abilities, game-breaking rules, and card effects that can potentially keep your opponent stunned
Turns 1 to 4: Chart A Course Your first goal is to establish a board state
Weekly Update (Jul 23): Commander Masters Decklists and Upgrades This week was saw the four Commander Masters Commander decks, which each included 10 new cards
Regarding EX cards, there's nothing written on them about limiting them to one per deck so this rule from rulebook applies [1] : When you are building a deck, you can have only 4 copies of a card with the same name in it, except for basic Energy cards