The combat damage trigger is absurd, not only drawing you a card, but letting you cheat on mana by casting virtually any spell for free
There is generally a crunch point at which their board position is too far ahead of yours and you cannot attack sensibly into it or use burn to resolve

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Controlling both shouldnt be too hard, but you have to have them survive until your next turn
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Each cast of High Tide adds another mana to your Island taps, which can lead to exponential growth