Amassing 38 cards in a players hand, let alone 38 dragons, can be considered a difficult task, mainly when ones hand size in MTG is limited to seven
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If Kolaghan keeps dashing like that, it may trigger some "whenever a creature enters the battlefield" effects, though that's not absolutely necessary to make Kolaghan worth playing
They're a really-not-new-at-this-point-but-maybe-new-to-you twist on double-faced cardsrather than transform, these cards let you play either of their two faces
Changes in the number of unlocked doors among Rooms you control that occur after the ability resolves won't affect the power or toughness of the token
Still, its likely worth the risk