It has a high Ink cost to summon, but the benefit is well worth it
If you arent sure of whether to include Fabricate in your deck, my general rule of thumb is to see if it meets at least one of these criteria: Are there approximately 10 valid targets to search for
Bayou Breeding Pool Canopy Vista Cinder Glade Commercial District Dryad Arbor Festering Thicket Hedge Maze Indatha Triome Jetmir's Garden Ketria Triome Lush Portico Murmuring Bosk Overgrown Tomb Rain-Slicked Copse Savannah Scattered Groves Sheltered Thicket Snow-Covered Forest Sodden Verdure Spara's Headquarters Stomping Ground Taiga Temple Garden Tropical Island Turbulent Fen Turbulent Wilderness Underground Mortuary Vernal Fen Zagoth Triome Ziatora's Proving Ground
With these shortcomings in mind, I generally reserve Beseech the Queen for 1-2 color decks, or any deck that can consistently access Urborg, Tomb of Yawgmoth early in the game
Defense Grid might be worth looking into to protect your combo, though it does make your instant speed interaction more difficult to cast
Still, it would be kind of surprising if it wasnt worth playing an actual second color (the version above plays eight white sources to show how easy it would be to sideboard white, while still keeping Engulf at full power)