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What is the Card Pool?

The card pool consists of each character and battle card a player opens or drafts in a Limited tournament. Players participating in Limited tournaments may freely change the composition of their decks between matches (but not games) by exchanging cards from their deck for other cards in their card pool without being required to return their deck to its original composition before their next match. Players must ensure their deck has at least the minimum 25 battle cards after making any modifications.
Source: Wizards of the Coast (2019-11-21)    【Link to Ruling】
Tags: Limited Deck Construction