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Spell Power Mastery Type Spell Card Archetype Endymion TCG Date 2019-04-19 OCG Date 2019-03-09 Card Text Add 1 "Endymion" card from your Deck to your hand, then you can count the number of "Spell Power Mastery" and "Spell Power Grasp" you control and/or have in your GY, and place that many Spell Counters among card(s) you control that you can place a Spell Counter on

(You cannot Summon other monsters the turn you activate this card (but you can Normal Set))

However, during the Duel Monsters era of the game, Mirror Force was a pretty neat way of getting rid of all your opponents monsters

What set is Jar of Generosity from