Her final, ultimate ability allowed the player to separate an opponent's permanents (Lands, Creatures, Enchantments, Planeswalkers and Artifacts) into two piles and forces them to sacrifice one of the piles
Four-Color Yorion runs into similar problems as Calibrated Blast, where they just dont have enough cards to reliably interact with Belcher
Paralyze is too often dead in the late game, and to be totally honest, it just annoys me to keep track of
Being able to steal an opponent's creature, block with it, and then sacrifice it gives players an incredible advantage
Umezawas Jitte has a GP Promo version but this was before full year promos
The natural inclusions in any deck playing Darcy are Mishras Bauble, Unholy Heath and, if paired with Blue, Expressive Iteration and Counterspells