Sentry of the Underworld [Theros] Sliver Set: Extreme Victory Card type:

Set: Extreme Victory Card type: Effect Monster Rarity: Rare Attack: 0 Defense: 2100 When this card is Normal or Flip Summoned

you can send 1 Monster Card from your hand to the Graveyard to Special Summon 1 Level 4 or lower Zombie-Type Monster from either player's Graveyard

You can only use this effect of "Maginificent Magikey Mafteal" once per turn

You cannot activate this effect the turn this card is Summoned or flipped face-up

Sentry of the Underworld [Theros] Sliver Set: Extreme Victory Card type:Set: Theros Type: Creature Griffin Skeleton Rarity: Uncommon Cost: {3}{W}{B} Flying, vigilance {W}{B}, Pay 3 life: Regenerate Sentry of the Underworld. When Athreos gathers the newly dead to be ferried across the Five Rivers That Ring the World, he sends skeletal griffins to fetch those who stray.