Any abilities that trigger when spells are cast will still trigger and resolve if appropriate, and any effects that count how many spells are cast will still count those spells if appropriate
Still, if your group is down to play with the flayer, supplement your gain control of spells with some reanimation spells that can target any graveyard
Play around with what you think will work, or just pick cards you like
It's a great Chocobo (and generic Bird) support card, helping to get a card into your hand and a ton of lands on the battlefield
It's definitely a foreboding standalone illustration, but the Dwarves are hardly visible in the art
Most often this is a mechanical thing, such as Gisela, Blade of Goldnight trying to put a huge clock on the game or Jori En, Ruin Diver trying to trigger her draw effect as often as possible