march of machine booster box MTG Pack Set : the (MOM) — Twenty Sided Helper card Opened up a Set Booster

This is easily identifiable by looking at the right side of the image

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Gavin Verhey from Wizards of the Coast explains Heroes of the Realm 3.0 3.1 3.2 Comment by u/Wizards_Drew on r/magicTCG on Reddit Outside of a unlisted rule for the Commander format that the original recipient of a Heroes of the Realm card is allowed to use it

So, Vexing Gulls Flash is pure upside, and this mechanic provides even more utility

MTG Double Strike Rules What do the MTG Double Strike rules say