It taxes your opponents whenever they try to cast spells or use abilities that target your merfolk, forcing them to pay extra mana
Even if you're just interested in the best chase cards, the Special Art Rare Zekrom and its matching Black White Rare are enough to grab your attention
Debtors' Knell There is a ton of synergy that you can run in order to get the best value out of the Debtors' Knell and the ongoing sweet card advantage it brings to the battlefield
Hidetsugu and Kairi Hidetsugu and Kairi has seen play in Standard, and its an absolutely game-winning bomb in Limited, but it seems a little weak in EDH
That all started with Vraska the Unseen, who sends a trio of Assassin tokens to do the dirty work
They also usually have a strong matchup against other top decks in the format too, like Gardevoir ex [Scarlet and Violet] and Mew VMAX [Fusion Strike]