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One-sided mass bounce effects like Summon: Leviathan also help you to reach the end game when youre running leviathans and other sea creatures, and Quest for Ula's Temple gives you some giant sea creatures for free if you can reveal a couple creatures off the top of your deck

Most of the time you counter someones spell, youre countering something they played on their turn, likely to try to win

Solemnity Solemnity is a bit niche, but its worth running as a combo piece for your deck

and Jin-Gitaxias, Progress Tyrant featuring the Kamigawa: Neon Dynasty set symbol with collector number 514

If you know a specific artist from Twitter, Instagram, or the like, their websites can be a great resource

Here's what's worth adding to your deck