Slivdrazi Monstrosity is a rare Legendary Creature — Sliver Eldrazi card from Mystery Booster Playtest Cards 2019 (CMB1), collector number 102. Current market price: $55.00, TCGplayer market prices via Scryfall.
Eldrazi you control are Slivers in addition to their other types. Slivers you control have devoid and annihilator 1. {3}: Create a 1/1 colorless Eldrazi Sliver creature token. It has "Sacrifice this creature: Add {C}."