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Sorry, but I have a habbit of looking for ways to make things Modern legal, especially when it's only 1 card preventing that. Heartstone can be replaced by Training Grounds to become Modern legal. This would require a change in the lands to include a lot of WU duals, but doing so also opens up U for sideboard options. To make it work, I'd go with this land base:3 Hallowed Fountain1 Prairie Stream4 Flooded Strand1 Island2 Emeria, the Sky Ruin2 Nykthos, Shrine to Nyx9 PlainsThat's 13 Plains for Emeria (65% of the lands), and 4 fetches to increase the chance of U (40% chance of a land making blue) for Training Grounds. Only 1 Island for Ghost Quarter / Path to Exile shenanigans. You're more focussed on the level up stuff, so these %'s are within acceptable limits.
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I honestly forgot that heartstone wasn't modern legal. I was probably going to replace it anyways since I never seem to draw the thing. As for adding another color, I debated it already but don't want to drop a ton of money on land for a casual theme deck like this