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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

Much like Even the Odds and Timely Reinforcements, control decks get the most use out of the Keeper because you also get to create Soldier tokens as a nice bonus so you dont get overwhelmed by your opponents attacks

Windshaping Celestial was so close

You may cast it

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

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