To receive the promo, customers had to purchase any two boxeseither Blue Shock [XY8], Red Flash [XY8], or one of eachat the time of the sets launch
White already has plenty of creatures that destroy enchantments such as Ronom Unicorn and War Priest of Thune, but red and green give us more flexible options that can deal with artifacts as well
But that won't matter
Then as long as you have 30 or more life, the dork gets indestructible to remove much removal interaction, only exiling mass removal or targeted non-destruction removal can get past this, and then it's +5/+5 size and then all damage to it is prevented
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Thats fine, but you can also tap it for infinite mana once as long as you control Urzas Mine, Urzas Power-Plant and Urzas Tower as well