Berserk (1738) (Rainbow Foil) [Secret Lair Drop Series] 259 cards on your field is

cards on your field is equal to or less than the number on your opponent's field

allowing players to explore different strategies in this new environment

For example

Set Name: Awakening of the New Era: 1st Anniversary Tournament Cards Card Number: OP05-073 Release Date: 2023-12-08 Rarity: Uncommon Card Type: Character Cost: 4 Power: 4000 [On Play] You may trash 1 card from your hand: Add up to 1 DON

Set Name: Pillars of Strength Card Number: OP03-058 Release Date: 2023-06-30 Rarity: Leader Card Type: Leader Power: 5000 This Leader cannot attack

Berserk (1738) (Rainbow Foil) [Secret Lair Drop Series] 259 cards on your field isSet: Secret Lair Drop Series Type: Instant Rarity: Mythic Cost: {G} Cast this spell only before the combat damage step. Target creature gains trample and gets +X +0 until end of turn, where X is its power. At the beginning of the next end step, destroy that creature if it attacked this turn.