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It does give your opponents Treasures, but we have creatures to deter them from cracking them, and you get the Treasures before they do, giving you access to the mana first

Haste is definitely there to help you use the activated ability right away, and makes it a cost of to copy the first ability

We already have one Merlin - Rabbit, but will add two more

Note that you may cast instants and interrupts after you have discarded

Additionally, Split Up might fit into the sideboard because I imagine you can set it up as a one-sided sweeper in creature mirrors

Thoden, King of Rohan Thoden, King of Rohans ability to give creatures double strike for a turn can make your attackers a lot more dangerous