mystery booster festival in a box Mtg expansion symbol Magic: The Gathering Secret Lair:

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Gravekeeper's Cannonholder X DARK Level 4 [ Spellcaster / Effect ] ATK 1400 DEF 1200 You can Tribute 1 "Gravekeeper's" monster, except "Gravekeeper's Cannonholder"

That the card is this high up on the list despite these problems should tell you something about its power level

For each opponent who doesnt, that player loses 2 life and you draw a card

Finding ways to fill your graveyard up to keep Lightning Helixing your opponents and their creatures sounds like a good time to me

It also has the Iron Fist attack, costing 2 Fighting and 2 Colorless Energy