The goal is to either +1 and untap enough mana from mana rocks that youre basically getting Tezzeret for free, or -3 to tutor up a good artifact and leave Tezzeret in play
Like most Pokmon cards, the value of Morgan depends on a few consistent factors: its rarity, the printing and finish (regular or foil), its physical condition, and the set it was printed in (Team Up)
Mana Drain is the best counterspell in Commander by far
It was a slow process getting the investment ready and digging far enough into the game to have the cards to spare but if a deck had no use for excess mana this was still a highly effective endgame especially for decks that used Thawing Glaciers
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Interestingly, they also claim its due to incorrect reference materials accidentally being given to their artists as official material