MDFCs in general only have the properties of their front face everywhere apart from when on the battlefield or the stack
High Utility, Low Price: Burnished Hart Disciple of Bolas Nekrataal Gray Merchant of Asphodel Shriekmaw Overseer of the Damned Sign in Blood Read the Bones Victimize Dread Return Mutilate Charcoal Diamond Mind Stone Swiftfoot Boots Worn Powerstone Myriad Landscape A whopping 27 cards here are playable pieces that could make it into most decks containing black, with only a small, few choices to really consider about their inclusion
When Arcane Savant enters the battlefield, you can copy that exiled spell and play it without paying its mana cost
Oona, Queen of the Fae [From the Vault: Legends] Set: From the Vault: Legends Type: Legendary Creature Faerie Wizard Rarity: Mythic
If you block an attacking creature then remove your blocking creature from combat somehow (often by sacrificing it or bouncing it back to hand), the attacking creature still counts as being blocked
You also get two foil Floodborn characters, The Queen, Commanding Presence and Gaston, Intellectual Powerhouse, as well as some shift targets and a couple of support cards in Grand Duke and Lefou respectively