The strategy here is to use cards like Mulch and Organ Hoarder to generate powerful card advantage with flashback spells like Shadowbeast Sighting, Winterthorn Blessing, and disturb creatures
Earthcraft is by far the most potent of all three as you can use dorks for mana right away but you do need to be careful with your mana base so as to have basic lands commonplace
Dismantling Wave can cover your bases by completely clearing the field of artifacts and enchantments too, and while 8 mana is absurdly expensive for this effect, you do also receive a few upsides: This ability cant be countered by most counterspells This ability is available at instant speed You get to draw a card This wont always be worth the extra mana youd pay over something like Austere Command or Cleansing Nova, but when it is, its probably saving you from losing the game
This isn't Donald's first Legendary, but it certainly seems like a memorable one
Similarly, creatures that enter the battlefield attacking later in combat won't be considered when determining whether or not a creature attacked alone