Eldrazi Monument (Blueprint) [Secret Lair Drop Promos] BT23-139 Set: The List Type: Artifact

Set: The List Type: Artifact Rarity: Rare Cost: {2} Blue spells you cast cost {1} less to cast

it is unaffected by other card effects until the end of the Damage Step

Set: XY: Base Set Type: Fairy Rarity: Ultra Rare Retreat cost: Colorless

or whatever extensive research you've done and can show that they're from that plane

Eldrazi Monument (Blueprint) [Secret Lair Drop Promos] BT23-139 Set: The List Type: ArtifactSet: Secret Lair Drop Promos Type: Artifact Rarity: Mythic Cost: {5} Creatures you control get +1 +1 and have flying and indestructible. At the beginning of your upkeep, sacrifice a creature. If you can't, sacrifice Eldrazi Monument.