lost caverns of ixalan set booster box MTG: The Explore the cavernous depths beneath Ixalan in a race to the hidden core The Lost Caverns of Ixalan

They are unlikely to fall into the cEDH meta and, therefore, can attack you on an angle that your deck is not prepared to compete with

When I went to put a card into one of these sleeves, I dinged the lower left corner

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Secret:Yes

While it normally provides the equipped creature with a +1/+1 counter whenever another creature dies if the equipped creature is a vampire, this number of counters gained this way is doubled, allowing for a single vampire to grow into a massive threat for a minimal cost.

Later in the game, the impact of this card is reduced a bit, since just one mana probably won't make that big of a difference on turn fifteen or more, but the explosive early game it can provide is impossible to ignore