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Combine one with any other Jumpstart booster to have a ready-to-play deck (just add lands and an opponent)

This isnt the most powerful card by any means but add in any kind of life gain synergy or recursion and Shield Mare will do more than pull its weight against aggressive decks

While youre the only player to control a tribute summoned monster (which in modern Yu-Gi-Oh is pretty likely, tribute summoning is slow in comparison to most summoning methods now available) and while your extra deck is empty, your opponent cant summon anything from the extra deck

While the $950+ sale on October 15 appears to have been a fluke, the cards still well above the $300 it was selling for at the start of August

Such great strategy marred by an extremely heavy buy-in and upkeep