pokemon charizard card v (001/021) cementing its place as a must Pokemon Card Game/[S4a] Shiny Star

While that is great when bringing an opponents life total down, its not good when you have a 3 damage spell against a big Creature with 6 Toughness

Krarks Other Thumb (and associated dice mechanics) Coin flips have been a part of black-border Magic since the start, but somehow rolling dice never had the same level of legitimacy, and it was pigeonholed as an Un-set mechanic until very recently

This is a tricky Landfall and face-down Creature deck that rewards sneaky gotcha! moments

Either of these things tends to mean that the benefits they might bring to decks are not coming close to covering the costs they impose on your cube as a whole