In a lot of matchups, the three-card hand of Urzas Power Plant, Urzas Mine, and Expedition Map is totally acceptable, and under the London mulligan, you have a very real chance of finding such a hand even after many mulligans
The Wall of Bones has pretty great art, and I just really like the fantasy flavour of a necromancer just creating a giant castle wall of femurs and skulls and ribcages that constantly regenerates as armies of orcs and dwarves try to break through it
If you only ever adapt this once, its still two mana to reanimate an opponents creature, stapled to a hatebear
So, with a 40-card deck and three copies of card, there is a 44.7% chance of drawing at least 1 or more copies of that card in your starting hand
You can Special Summon this card from your Spell/Trap Zone, OR place this card face-up from your side of the field or your hand to the Spell/Trap Zone as a Continuous Spell Card, and, if you do, it gains this effect: Once per turn: You can Fusion Summon 1 Winged Beast-Type Fusion Monster from your Extra Deck, using monsters in your hand as Fusion Materials
