Burst Seal (バースト封印, Baasuto Fuuin) is a keyword which debuted in BS38. The only spirit to possess it is The OxTwelveGodKing Avalanche-Bison. Similar to High Speed Seal, it combines Seal with another keyword, in this case, Burst:
- [Burst Seal: After your Life decreases] If your Life is three or less, summon this Spirit card without paying the cost. Then, send the (Soul Core) from one of your Spirits to your Life.
This keyword allows the player to surprise the opponent by summoning a God-King without paying the cost, as well as giving another method of Sealing on the opponent's turn.
Note that an effect that targets cards with Burst can also target cards with Burst Seal. This is also the same case when an effect targets cards with Seal.
For more Q&As, please refer to the general Q&As for Burst.