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The mana base also seems notably poor quality to me

Borderless Frame Break You can also find borderless frame break cards in Modern Horizons 3 Play Boosters and Collector Boosters, with 30 in total across the set (26 rares and 4 mythic rares)

Change of Plans Change of Plans can be rather mana intensive, but it makes up for that by having a use when you dont need to shelter your board from the next Wrath of God

And theres something to say about Eldrazi Monument in cat typal

Capable of becoming Indestructible for little cost, Svyelun both protects your other Merfolk and offers a steady stream of card draw

Now you're gaining life and resurrecting critters every turn, which is quite good for four mana