The card shared with ICv2 was "Shred." This card is an Assassin attack reaction, which clearly alludes to an Assassin class of Hero or at least new mechanics for Assassins being included in this set. "Shred" is an interesting utility card that doesn't actually buff an attack, but helps a purposeful attack to deal damage by reducing an opponent's ability to block the damage. It is possible that this card has unseen synergy, thus far, with specific Assassin attacks that have various post-damage abilities similar to some of the Guardian cards that have Crush.
The Flesh and Blood TCG World Championships is coming up on November 4-6, 2022 (see "'Flesh and Blood TCG' World Championships").
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