Although Yuffie enters attacking when its ninjutsu ability resolves, it was never declared as an attacking creature (for purposes of abilities that trigger whenever a creature attacks, for example)
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March of Progress and Second Harvest are both basically game-ending spells
The player who detonates Roots of Yggdrasil to stop both players from drawing, or the player who plays into Roots of Yggdrasil to force the activation in order to continue the game Ive seen this happen far too many times and it is why I suggest continuing playing to avoid hesitation, promote friendly gameplay, and call your opponents bluff
Mono-Blue decks used to need early creatures that already had flying or unblockable
It may also be the case that Faiths Shield would be good in this deck in some number
