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Ethereal Armor turns any creature into a threat for one white mana

Its on this list because its an important card in the context of the format

Quandrix Command 1 graveyard hate

Turning all your creatures into mana dorks sets up some explosive turns, especially paired with greens big card draw spells like Last March of the Ents and Rishkar's Expertise

If you play all four copies in your main board, your opening hand has a 40% chance to have one copy of the card and a 60% chance to not have any of the four copies

Writing for an official MTG blog post, Rasmussen says "beginning February 3, when you have cards, you can play them"