magic the gathering dominaria united draft booster box Display 10 Common Dominaria United Draft Booster Box

Since "Swordsoul Tokens" are always Special Summoned with an effect that also prevents the Summoning player from Special Summoning any monsters from the Extra Deck (except Synchro Monsters) while the Token is on the field, cards such as "Dimensional Barrier" (declaring "Synchro") or "Discord" will prevent them from Summoning Synchro Monsters too

For example, its 100% okay if you and your opponent both control your own copies of Thalia, Heretic Cathar

Note that most of the time, this is irrelevant - you're going to use them for Extra Deck plays anyway

This will keep Barbaracle armed against effects like Klefkis Memory Lock