Altar of Dementia [Modern Horizons]

Altar of Dementia [Modern Horizons]Set: Modern Horizons Type: Artifact Rarity: Rare Cost: {2} Sacrifice a creature: Target player mills cards equal to the sacrificed creature's power. "It is not that you will go mad. It is that you will beg for madness." Volrath

Set: Base Set 1st Edition Type: Psychic Rarity: Common Retreat cost: 0

you may have Valakut

when Cromai attacks or leaves the arena

You can detach 1 Xyz Material from this card

Set: Modern Masters 2017 Type: Sorcery Rarity: Rare Cost: {2}{B}{B} Destroy all creatures

has frequent visitors

if this card would be destroyed by battle

Set: Sun & Moon: Crimson Invasion Type: Lightning Rarity: Secret Rare Retreat cost: Colorless

or another monster's effect

If Command and Conquer hits a hero

Set: McDonald's Promos: 2016 Collection Type: Colorless Rarity: Promo Retreat cost: Colorless

The rifts reach into infinite time streams