Sentry of the Underworld [Theros] Sliver When your opponent''s monster attacks

When your opponent''s monster attacks this monster with an ATK higher than "Relinquished"

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

If a Spell/Trap Card is activated in this card's column: You can Special Summon 1 Level 4 or lower "Magical Musket" monster from your Deck in Defense Position

Set: The Secret Forces Card type: Ritual/Effect Monster Rarity: Secret Rare Attack: 2900 Defense: 1700 You can Ritual Summon this card with any "Nekroz" Ritual Spell Card

Sentry of the Underworld [Theros] Sliver When your opponent''s monster attacksSet: 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.