So far, each battle has a specific subtype of battle called siege, so most of the rules we know specifically apply to those battles but may be different for future battle cards
Believe it or not, this card was once restricted in Vintage
can be accessed in the Events tab of Arena, under Limited

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When Prince John is on the field, you get to draw a card for every one your opponent discards
Plus, this swords a great source of ramp if you can continue to connect in combat