Even though they are treated as colorless cards during the game due to the devoid mechanic, they still count as colored cards when it comes to deckbuilding, which means devoid cards can't be legally run in a deck led by Kozilek, Butcher of Truth
On another note, it's a card benefitting from the usage of exile effects, which is great to see as these are less common than graveyard interaction cards
Just my opinion, but I strongly feel that any kind of extreme rarity (or unique) element to a game should by only a component quality upgrade like the painted tokens you mentioned
You enjoy a varied playstyle While each deck in the Doctor Who Magic: The Gathering line has a preconfigured mechanical focus, theres plenty of room to experiment
+1/+1 counter decks love Shalai, but so do Enchantress decks, Angel tribal, and hatebear-heavy builds