mtg cards that reduce cost of activated abilities Zirda, the Dawnwaker Abilities cost less : r/mtg

Each game of Magic: The Gathering represents an epic battle to the death between you and your fellow Planeswalker who knew cardboard could be so hardcore

As such a four colour card should be about two mana higher than the curve

Historically, Cabal Therapy has paired with other discard spells and Gitaxian Probe so you have a better chance of getting a look at the opponents hand before casting it, but for Cabal Therapist thats another layer of setup and another deckbuidling restriction for a card that clearly wants to be paired with a high density of creatures or token generators so you can fuel the ability turn after turn to force your opponent to spew their spells quickly or lose them

Since less-supported types also tend to have fewer creatures in their card pool overall, they might have certain blind spots on their mana curve or list of key effects, and they probably cannot produce many on-type creature tokens to most efficiently benefit from team-wide buffs