Its because all these mana sinks are providing is free advantage from the opponent
To be fair, serialized cards will always carry some value much like the Masterpiece s do
9: You get an emblem with "Whenever a player casts a spell, you create a 2/1 blue Ninja creature token." Illustrated by: Evyn Fong Kaito, Cunning Infiltrator Historic Brawl decks Kaito, Cunning Infiltrator Brawl decks Rulings 2024-11-08 You don't have to choose a target for Kaito's first loyalty ability
2024-09-20 You must ensure that your face-down spells and permanents can be easily differentiated from each other
Burning Cinder Fury of Crimson Chaos Fire is a hilariously long name, and the card is also on its side for some reason
Going to 7 loyalty and making 2 1/1's means it's unlikely to die, the 2 CMV return can get you a bunch of useful creatures or fetchlands back, the damage either pings off troublesome creatures or goes face, and the 6 means you get 2 more shots at any of the above