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The ingenuity of lesson/learn is that almost every lesson becomes playable when you dont have to put it in your mainboard

When this resolves, it buffs all your other dragons with a +1/+1 bonus, and the fact that storm makes copies of iteach one a tokenmeans you can suddenly have a sky full of fire-breathing threats that act as lords for others of their kind, going from a single pump to a massive Craterhoof Behemoth buff

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If the enchanted creature is no longer on the battlefield when Penumbra Umbra's second ability resolves, use its copiable values as it last existed on the battlefield

Its about as basic as this effect gets, but the opportunity cost is so low