Mana produced by Creeping Peeper's activated ability can be used to pay morph or disguise costs when turning a face-down permanent face up or to pay costs associated with turning a manifested or cloaked permanent face up
Its worth noting that this approach to card analysis and evaluation isnt perfect, nor will it give you the full picture
MODERATELY PLAYED Visible but contained clouding
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Memory Erosion Playing a similar role to Psychic Corrosion, Memory Erosion instead only requires your opponents to cast spells
Alongside that, you can also give Skithiryx, the Blight Dragon haste for one Black mana, and regenerate it for two Black mana