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Just having a 3/3 in play hits the 10-toughness threshold, and in a dedicated high-toughness deck, you can get many more benefits

Ancestral Recall Ancestral Recall is the most powerful and highest valued 1-drop blue card draw spell in all of Magic: The Gathering

it also cant be retrieved from the discard pile once used

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Also, there are lots of X spells that create creatures at instant speed, like Call the Coppercoats, Decree of Justice, White Sun's Zenith, so you could set up an easy win in EDH by casting a big spell, attacking the next turn, and untapping to win

His deck using this card will most likely be his Blue-Eyed deck