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Using waterbending as a ward cost is also just cool tech (though admittedly worse than just having ward instead)

Legend goes that Alchors Tomb began its life in design as Alchors Tome, or a big ol book full of wizard spells

If you tire of treasure, or you dont want a Planeswalker Commander, then Shanid is another great Mardu option

You can even tutor this land out with plenty of colorless cards like Expedition Map and Urza's Cave

Radiation counters have the following effect: Effectively, you mill a card at the beginning of your precombat main phase, and every time you mill a nonland card into your graveyard, you lose one life and remove one rad counter